Muktol

[[Brave the Elements]] for some protection and [[Angel of Jubilation]] come to my mind.

+1
This deck just cries for [[Assault Formation]]. This would also enable you to use some cheap spiders to speed up your play: [[Canopy Spider]], [[Hitchclaw Recluse]], [[Juvenile Gloomwidow]] (Who can also deal with indestructible creatures), [[Sporecap Spider]], [[Tower Defense]] or even [[Slagwurm Armor]] as equipment.
Personally I would also remove [[Nyx Weaver]] for 2 additional [[Obelisk Spider]] and at least 2 additional lands.

Greetings
Muktol

[[Steeling Stance]] could be an alternative to [[Marshaling Cry]] as it allows you to buff a single creature each turn instead AND all your creatures for one turn instead of mass-buff only. Drawback you loose the vigilance, so maybe use a 2/2 split.
I would also focus more on lifegain than the angel's (or exalted) theme as this would give you access to some interesting cards: [[Perimeter Captain]] (needs defenders), [[Ajani's Pridemate]], [[Rhox Faithmender]], [[Chalice of Life]], [[Angelic Accord]], [[Serene Steward]], [[Soul Warden]] (needs many small creatures) only to mention a few. Safe for the Faithmender these are all budget choices.
If you want to stick to the chosen theme then you could take a look at [[Sigiled Paladin]] as additional exalted creature ([[Sublime Archangel]] would be THE creature for this deck but it's definitely not budget) or [[Battlegrace Angel]] as stronger version of [[Seraph of Dawn]].

Greetings
Muktol

[[Blasting Station]] or [[Barrage of Expendables]] could be another idea to make sure you don't waste one of your creatures (or give your opponent a creature back) when you don't have a [[Fling]] on your hand. Another option would be to add black as colour to get access to spells like [[Altar's Reap]] or creatures like [[Bloodflow Connoisseur]].

Greetings
Muktol

Gatherer information for the card:
25.08.2017 Ramos’s triggered ability counts the number of colors a spell has (from zero to five), not how many colored mana symbols are there in its mana cost or how many colors of mana you spent.
25.08.2017 If you cast a colorless spell, Ramos’s triggered ability triggers, but it won’t get any +1/+1 counters.

Just be aware that [[Empty the Warrens]] and [[Grapeshot]] don't profit from spells copied by [[Zada, Hedron Grinder]].
[[Bedlam Reveler]] could be an idea to put into this deck for further carddraw, maybe also some [[Crimson Wisps]] as additional cantrip. [[Legion Loyalist]] and [[Goblin Offensive]] could also be worth a look.

Greetings
Muktol

Festering Mummy and Shambling Goblin are cards that want to die (or get sacrificed). The reason I mentioned Viscera Seer are those 2 cards and their combination with him. If you block something that wouldn't die from combat damage alone you can at least make some CA with the effect from Seer.
Would be interesting to get some informations on how well the deck worked. I fear that against most other decks you will be pushed into defence and I don't know if Gray Merchant and Corrupt will be enough to finish your opponent fast enough.

Desecrator Hag is a great card as it allows you to re-use your Gray Merchant of Asphodel if he is in your graveyard.
Qarsi Sadist could be switched for Viscera Seer if you favour card-advantage over lifegain.
Tragic Slip is one of the best removals in my eyes, especially when you have something that forces you to kill/ sacrifice something...like Qarsi Sadist (if you keep him)

Greetings
Muktol

The problem with Invigorate is that this deck is tagged as modern legal, which Invigorate isn't.
Infect decks normally try to be as fast as possible because their creatures are rather weak. If you favour a slower aproch then i can recommend Wild Defiance, tough you might want to take out some creatures and add some more instant/ sorcery spells.
The most cost-effective pump spells would be Giant Growth, Groundswell and Mutagenic Growth, Titanic Growth if you want a cc2 spell. Evolution Charm is a great way to bypass your opponents defense while Ranger's Guile or Blossoming Defense offers some good protection against removal. On the removal side Doom Blade or Go for the Throat are good and cost efficient cards, if you favour a -x/-x version take a look at Tragic Slip.

Greetings
Muktol

+1
I'm not a real big fan of Vitu-Ghazi Guildmage, at least not 4 copies of the card. His abilitys puts him more into the cc4 or even cc6 slot, depending on what you want to use, so having two of them on the field won't help you much.
Maul Splicer and golem tokens could also be an option, tough maybe more a separate deck-idea.
Geist-Honored Monk or Wayfaring Temple would be strong finishers tough they require more of a mass of creatures than the class you're trying to achieve here. If you want to swing into that direction then Evangel of Heliod could be worth a look, tough it would also introduce a new mechanic to the deck: Devotion. Feral Incarnation would also be an option for a mass-token deck , but you would have to explain convoke as new mechanic.
Honourable mention: Timely Reinforcements. Most of the time it should provide you with both, tokens an life, as other decks will be faster and thus have more creatures and life.

Greetings
Muktol

I gave one player a gruul stompy deck (https://www.mtgvault.com/muktol/decks/rg-gruul-beginners-deck/) and the other got a simic evolve deck (https://www.mtgvault.com/muktol/decks/ug-simic-beginners-deck/). The learned the basics fast enough, the only issue being the manabase, learning that they untap at the beginning of a new term and can be re-used every turn. The problem I/ they ran into was in the last turn: Simic hasd some creatures with +1/+1 counters on them out and played an Overrun, which was too much and too complicated for the other player to calculate. The simic-deck was played by someone who plays a lot on the computer and is a technician, tough I thought that he might have more problems with this as he never had played anything like magic before. But the problem occurred with the player that already had played Yu-Gi-O...but only on the computer where the machine did all the calculations for her.

I try to limit the number of different mechanics I use in a beginners deck to a certain amount and use only cards that have one use/ ability. As I'm printing the cards it's no big deal to have two decks, or some replacement-cards, if the player learns faster than I thought and is ready for some advanced cards. I also don't include sideboards because for that you need to play at least 2 games against the same player and the same deck, and you need to know your deck and you opponents to decide what to remove and what to add.

+1
Goblin Electromancer could be an option instead of e.g. Mercurial Chemister and Flame Slash instead of Fiery Impulse. I would also use a 4th copy of Curiosity to make sure you have enough carddraw. Also Unsummon or Echoing Truth could be an idea. If you want to make use of Mercurial Chemister's red ability then Lava Axe would be worth a look.
Last year I had 2 new players that wanted to try magic and see if they would like it. I had a good feeling as one already had been playing Yu-Gi-O (on the computer) and the other was a clever chap. After explaining the magic-colours, their strategy's and so on they each decided on a colour-combination and I threw together 2 decks that I thought where simple enough (Basically Gruul Stompy and Simic Evolve). Well sadly it wasn't simple enough (for the one that already had played Yu-Gi !, the other one hadn't any problems with the decks). I'm still waiting for a second chance to try to explain it again, this time with more simple decks. So you should either have some cards that you're able to switch out things like Izzet Charm or Mercurial Chemister for or have some real simple decks if you find someone like those two.

Imperious Perfect is a cc3 card but it might be worth a look instead of Dwynen's Elite. It's slower but more steady in it's token production and is a lord itself.

I'm always forgetting these "new" dual-lands. Still automatically going for Guildgates&Co. even if there are better cards.

Thank you for your suggestions. I added 4 Doom Blade instead of Go for the Throat which also enabled me to add a 3rd Isolated Chapel.
Even if Anointed Procession is the cheapest of all token-doublers it still rather expensive. Also I would need 2-3 of them in the deck to (more or less) constantly draw one. At the moment I see no chance to sueeze ithat in, perhaps when Isolated Chapel, or any other card, becomes cheaper. Lets see what Domria and the new Core Set will do to the prices.

I would throw in some protection for Wort, Boggart Auntie so that she doesn't die on every single removal spell. Champion's Helm, Mask of Avacyn or Swiftfoot Boots are some good artifacts that do this job. Strionic Resonator would allow you to copy Wort, Boggart Auntie's ability to get 2 creatures per turn, usful when combined with Daretti, Scrap Savant or after a mass-removal.
Then there is Konda's Banner and Dragon Throne of Tarkir, two additional cards to mass-strengthen your creatures.
The big question is how you want to create your tokens when you don't have Krenko, Mob Boss or Boggart Mob on the battlefield? You need one of 2 cards out of 100, and have only 4 cards to search for them.
Also ther are some cards that are highly effective in normal decks but loose it's effectiveness in commander-games. Lightning Bolt/ Bolt/ Tarfire is a good example for that. normally you will never want to get Tarfire back from your graveyard with Auntie's ability because you will have better things to get from there. The creatures in commander often get very big or are enormous masses so removing a single, small, one often nearly does nothing to your opponent. Then there are more than one opponent, so that when removing a single creature you still have the others against you. I would take a look at some of the mass-removals available, maybe you even find a one-sided so that your opponents loose all their creatures and you keep yours.

Greetings
Muktol

That would be good news. I was thinking of adding simple search-lands like Terramorphic Expanse or Evolving Wilds tough that would slow the deck down a ?little? bit.

Thanks for the answer. Sorry for my late reaction, somehow I didn't get/see/realize the notification message.
I didn't include Spectral Procession because I'm not sure if I can get the required {W}{W}{W} on the table fast enough..and you don't want to cast this with anything else I think.
Beckon Apparition can be a good card, tough it adds "only" one flying token. I can't estimate how important the removal of a card from the graveyard will/can be for a beginner-deck.
Harsh Sustenance is definitely a card I will add, maybe instead of Timely Reinforcements.
The problem I run into with most of the budget decks is that the dual-lands are rather expensive. So either keep it mono-coloured or near that or reduce the power of the rest of the deck to make it more stable to play in therm of the mana-base.

I finally had the time to check some cards, and here are the suggestions:
Gone Missing ...expensive to play but can put an expensive permanent your opponent controls on top of his library or let you re-use one of your ETB-triggers. Also gives you an clue artifact token that lets you draw a card.
Jace's Scrutiny ...questionable if this will be strong enough for commander. Gives a creature -4/-0 and you receive a clue artifact token.
Contract Killing ...basically a Murder for 5 instead of 3 mana but also gives you 2 artifact treasure tokens that can be sacrificed for 1 mana each.
Depths of Desire ...cheaper but less potent version of Gone Missing as you can only target creatures whith this. Gives you an artifact treasure token to sacrifice for mana.
Pirate's Prize ...draw two cards for 4 mana and you get an artifact treasure token.
Filigree Crawler ...a 2/2 artifact creature for 4 mana that replaces itself with a 1/1 flying artifact token.
Gleaming Barrier ...0/4 defender artifact creature that gives you an artifact treasure token when it dies.
Myr Sire ...1/1 artifact creature for 2 mana that replaces itself with a 1/1 artifact creature when it dies.
Prying Blade ...an equipment that can continuosly profide you with treasure tokens to sacrifice for mana.
Disciple of the Vault ...1/1 creature for 1 mana that lets target opponent loos 1 life whenever one of your artifacts is pu into your graveyard

Thank you for the clarification.