Thoptor Instant Army (Legacy)

case you haven't seen this before, combo works like this: Cast Sword of the Meek, then Thopter Foundry. Activate Thopter Foundry, sacrificing the Sword to it, which puts out a 1/1 thopter and gains you 1 life. Sword of the Meek then triggers because a 1/1 came into play, bringing the Sword out of the graveyard and attaching it to the newly made 1/1 token. Basically, 1 mana = 1 token and 1 life (amazing value). Add Ashnod's Altar into the mix, and every other token you create, you can sacrifice for 2 more mana to keep the chain going. So, as much life, tokens and colorless mana as you want. Honestly, though, the main combo is so powerful (really, from the fourth turn forward you leave all of your mana untapped until your opponent's end step so you can cast instants/make new tokens. 4-5 tokens and life every turn is difficult for a lot of aggro decks to deal with already, notwithstanding you can always be the one with answers in your hand).
Muddle the Mixture and Fabricate find Thopter Foundry and Sword of the Meek, run more Muddles than Fabricates because Muddle is more flexible and finds the two most vital components (plus Ratchet Bomb!). Everything else can be whatever you want it to be though, the main combo is only 8 cards, and while Enlightened Tutor would make this a lot stronger (tutor up Humility, etc.) it's not absolutely necessary as Fabricate can fill in.