Terrifying Alliance - Pauper 2017

This deck, Terrifying Alliance, is made up entirely of 35 Allies, and 25 lands.  The reason for that is that almost all of the allies in this deck get pumped when another ally enters the battlefield, such that while a single ally alone in this deck is not impressive, Terrifying Alliance has a tremendous amount of synergy that is hard to fight off due to the sheer number of ally creatures.  Likewise, the converted mana cost of most of these cards is good for playing against blue, as the lower the cmc of an ally, the more worthless a card like Counterspell, or even the white Journey to Nowhere becomes.
This is the 3rd and by far the best version of this deck, or at least the most competitive.
Most of the more recent allies are not used because they are not good cards.
Allies never got that popular in MTG, but this is a good deck, at least for pauper, and last I checked, all the cards in it cost only a few pennies.
The strategy is to play that cards that boost first, and then have them boosted again and again once other allies come into play.
It is also worthy of note that the abilities of many of these cards occur when they come into play, including themselves.  For instance when Ondu Cleric enters the battlefield, it, itself will gain a life.  Similarly, with the Oran-Rief Survalist; when the card enters the battlefield it becomes a 2/2, due to a +1/+1 counter it gives to itself, and if Ondu Cleric was in play you would gain 2 life because both Ondu Cleric, and Oran-Rief Survivalist are both allies.

Land - 25	Allies Black - 10	Allies Blue - 4	Allies Green - 12	Allies White - 9
3 Rupture Spire	2 Mana Allies	3 Mana Allies	2 Mana Allies	2 Mana Allies
4 Transguild Promenade	4 Bojuka Brigand	4 Umara Raptor	4 Oran-Rief Survivalist	4 Makindi Aeronaut
2 Bant Panorama	4 Kalastria Healer	39		4 Ondu Cleric
2 Esper Panorama			4+ Mana Allies
2 Evolving Wilds	3 Mana Allies		4 Graypelt Hunter	3 Mana Allies
2 Terramorphic Expanse	2 Vampire Envoy		4 Tajuru Pathwarden	Makindi Patrol
2 Forest	35		51	60
Island
2 Plains
2 Swamp
3 Abundant Growth