White Green Ally Aggro
Still being tweaked, but the generally idea is to use Harabaz Druid to dump your hand, Hardened Scales to make all your counter gainer allies massive in the process, Mirror Entity to make your whole team's base P/T massive from the extra mana produced by the druid, and then
Kabira Evangel
to make your team unblockable for a huge swing to win the game somewhere between turns 4 and 6. The only ally I'd imagine that might need some explaining otherwise is
Expedition Envoy
and
Sylvan Advocate
, who are only here because they're cheap and have the ally typeline. Gavony Township is there if things goes long, it and the scales make for a terrifying combo.
Ondu Cleric
and
Lantern Scout
are in the sideboard for decks that are faster than the base deck, as they can gain stupid amounts of life and the allies should inherently win the long game against anything faster than them, as well as your typical graveyard and artifact hate.
Other cards I'm considering are Gideon, Ally of Zendikar because he lets the deck go long but still has an effect the moment he comes down. The only problem is because of Collected Company, the deck really needs as many creatures as possible, and he technically isn't one for the purposes of those cards.
Veteran Warleader
is also a possibility, but I don't like how much he relies on other allies to get anything done, he doesn't benefit from the scales, and that I'll need to be tapping down allies that I may rather be swinging with or tapping for mana for his combat abilities. Lead the Stampede is a card that's been on and off, it refuels really well but it obvious has no effect on the board. Return to the Ranks is another maybe, however considering how light the deck is on lands, it's unlikely there will be enough mana on hand to fully recover from a boardwipe.
Made with a lot of help from this wonderful primer by JLenzen, I highly recommend you check it out if you're even slightly interested in allies.