The first of the two combos consists of the cards Elvish Archdruid and Seedcradle Witch. The combo begins by tapping Elvish Archdruid for mana[make sure you have at least four elves on the field to produce enough mana to repeat the combo] and then convert one of that to white mana using Orochi Leafcaller. Spend four of the mana on Seedcradle Witch's ability and target Elvish Archdruid, giving it a boost and ontapping it to repeat the process. This synergizes well with the next combo and leads to the endgame, so make sure you repeat the process a lot. You can also cast an Appeal to double its power. A slightly more awkward alternative to the combo is Manaforge Cinder[or any permanent with at least two of the following colors in its cost: blue, red, black], Bloom Tender, Seedcradle Witch. I prefer the Elvish Archdruid & Seedcradle Witch though, because it is easier to set up and is much more budget.
The second combo is pretty straight forward, utilizing the abilities of Midnight Guard and Presence of Gond. Start by attaching Pesence of Gond to Midnight Guard and, using its new ability, tap it to create an Elf Warrior Token. When the Elf Token enters the battlefield Midnight Guard untaps so you you can continue until you have a myriad of Elves at your disposal. You can upgrade the combo by throwing down an Essence Warden so each time you activate the cycle you gain a life as well. I haven't found any replacements or alternative cards for this combo, so I could use your help for that.
I advise that you set up both combos and use them at the same time, because they work really well together. To fully exploit Elvish Archdruid, use its +1/+1 for all elves to bolster your tokens and make them slightly less prone to board sweeps. To further ensure the safety of your creatures, I am running Ezuri, Renigade Leader [which can also be used as an alternative endgame], Avoid Fate, Immolating Glare, and Roar of the Kha.
Finally, once you have what you feel is enough Elves and a lot of power on Elvish Archdruid, on the next turn cast your Overwhelming Stampede to give all the scrawny Elf Tokens the power of your Elvish Archdruid and make them look like they hit the gym. To cast your endgame a turn sooner, you can run a Burst of Speed and just use Birds of Paradise or Orochi Leafcaller to cast it.
If you want to stick with just one combo, you can ad a card like Elvish Vanguard in the place of Elvish Archdruid, though it won't be as good for mana. You could even just run the Elvish Archdruid and Seedcradle Witch combo, then play a Fling, or something.
Please try the deck out and let me know if you liked the deck and if I missed anything important or any upgrades that can be made. Any feedback would be greatly appreciated!