Alternate Deck name: "When in doubt, Jund 'em Out"
So this is a project I wanted to engage in- To make a set of 10+ super-budget 60-card decks that are simple, relatively easy to play, relatively easy to understand, and bring across the fundamentals of how Magic Works. We've since gone way past 10, with tons more in the works, and I've really enjoyed the challenge of trying to make these decks easy to play and understand, fun, and all under a $15 budget, sideboard included.
The main goal here is that you could easily build these deck for a low cost and use them as an easy introduction to how magic works, to teach a group of new players both how to play, and give them a sense of Why, a sense of what fun things they're getting into. These decks aren't gonna be particularly good, or even legal in any particular format if it stops me from including a card I think is good for the deck, but they should be fun and interesting without being too hard to get into. They should be an easily-accessible example of how fun Magic: The Gathering can be.
So I redid this deck recently- originally I just wanted it to be a Broodmate Dragon deck, but that ended up being too slow, so it instead became an odd, grindy midrange deck with Broodmate in the sideboard to really get your value going. I also just like that this deck is mean, resilient or high-value creatures all the way down, and there's just not much to do about it.
As for budget: Maindeck cost is currently at a little less than ~$12 (according to the middle blue numbers on this very site under estimated value), sideboard at about ~$3.30, so we're actually 20 cents over, but I was willing to call it close enough. Hell, replace Back to Nature in the sideboard with 2 copies of naturalize and you're rock-solid.
So mostly this section is going to be notes on why I think these are good cards to learn from:
Ranging Raptors is your first creature you're likely to play, and your general goal is "get it to replace itself with a land." If you get more than 1 land off of it, sweet, that's going to get you to your big plays really effectively. If you only get 1, perfectly fine, even if you weren't able to trade off the Raptor. If they just cast Murder or Last Gasp on it, that's too bad, but it happens. If it dies to your own Slagstorm, oh well, you were clearly against a board that needed defending against, and you get a land off of it at least.
Boon Satyr is the other 3-drop: Dies easily, but trades well thanks to flash as a creature, and does wonders as a 5 mana aura that leaves a 4/2 behind. Good card on 3, better card on 5. I love Boon Satyr in midrange decks like this, it really shines here.
At 4, Reaper of the Wilds is just a really good card, it's big, it hits hard, it survives a lot, and it can protect itself as long as you keep up mana. Sharing the slot with it is freaking Flametounge Kavu, a classic card that is actually a good lesson for players- creatures that remove other creatures are freaking busted, and really good. If there were a 3/2 for 4 that dealt 3, I'd use it instead as a more fair card, but you build decks with the cards that actually exist, not the ones you'd like to. But it's still a good lesson for players to realize Kavu is probably the best card in the deck.
At the top of the curve, we have Carrion Thrash, which is really just a strong value play- either you beat them to death with this 4/4, or they kill it, and you spend 2 to grab whatever the heck you want from your graveyard to out-value them. Considering Kavu and Reaper both have significant potential to 2-for-1, this can be pretty brutal.
Slagstorm kills few of your creatures and is probably one of the best boardwipes in these colors, particularly within my budget, Last Gasp and Searing Spear are great, classic removal spells, accompanied by the heavier-hitting guns in murder and putrefy. I decided to lean more on the heavy spells in this deck, because there are good options for beating faster decks, and a few of your creatures can help you get ahead on tempo pretty effectively.
Altar's Reap is a great card for new players to learn how to use, sacing creatures about to die to gain value off of them, and I've been trying to use it in midrange-y black lists.
Manabase is meant to be a touch lacking, but also super-budget. Look, you try to build a 3-color mana base for less than $2, it's gonna suck, alright? That's the name of the game with budget 3-color manabases.
As for the sideboard, this IS supposed to be a sideboard they learn how to use, to make their deck perform better in the right matchups, or just in general to customize their decks within constraints.
Broodmate Dragon is a mean value card, while Vampiric Outcasts are a good card for turning the corner in agro matchups, even if it takes an attack to bring online.
With putrefy 4x in the mainboard, artifact hate seemed redundant, so I grabbed Back to Nature instead of naturalize, to heavily hate-out enchantments. This is only a little awkward due to the presence of Font of Return in the sideboard as a value option. Truth be told, those slots might be better-suited to Painful Truths, but I like Font of Return making it clear that this deck's value plan is graveyard recursion more than card draw. It feels more Jund-y. Also Painful truths is quite a bit more expensive budget-wise, and we're already pushing it.
And there are a few other removal options, so you can board out some murders against agro or a less-than-helpful last gasp against control or other midrange decks.