Cards explanation
Lands:
Ally Encampment return ally which would die to your hand and cast it next turn
Enchantment:
Hardened Scales +2/+2 counters instead of +1/+1 (synergy with Dromoka's Command,Metallic Mimic, Hada Freeblade, Kazandu Blademaster, Oran-Rief Survivalist and Talus Paladin)
Instants:
Dromoka's Command protection against burn spell, sacrife an enchantment, +1/+1 counter and destroy a creature? Is here something which this card can not do?
Creatures:
Akoum Battlesinger aggressive creature who boosts other allies
Hada Freeblade the cheapest killer with its +1/+1 trigger
Harabaz Druid tap it and you get 1 mana of any colour to your mana pool for each ally you control
Kabira Evangel protection for your creatures until the end of turn
Kazandu Blademaster this powerful ally is your opponents nightmare with first strike, vigilance and +1/+1 counters
Oran-Rief Survivalist another killer with +1/+1 counters
Reckless Bushwhacker play this card in tandem using surge cost!
Talus Paladin lifelink for your creatures until the end of turn and of course it has +1/+1 counters
Sideboard
Fragmentize cheap enchantment and artifact destroy
Kataki, War's Wage artifact hate
Leyline of Lifeforce protects creatures from being countered
Shapers' Sanctuary please path / burn / destroy my creature
Cards to consider
Return to the Ranks retun your dead allies from graveyard to play - very useful after boardwipe
Ondu Cleric 1hp for each ally? are you crazy?
Scout's Warning cast your creature in opponents turn or just draw a card if you need
Metallic Mimic great synergy with Hardened Scales
Gavony Township +1/+1 counter for every creature
Lead the Stampede decent card draw
Oust cheap removal spell
Banishing Light exile anything - even plainswalker
Oath of Gideon 2 allies for 3 mana?!
MImic Vat allows you to cast dead creatures every turn which means you can trigger ETB effect even if you have empty hand
Cloudshift allows you to trigger ETB effect or protect your creatures from being destroyed
Anafenza, Kin-Tree Spirit this ability is awesome together with Hardened Scales
Thalia's Lieutenant has the same effect like allies but unfortunately she is not an ally
Kor Bladewhirl first strike for your ally creatures
Lantern Scout lifelink for your creatures until the end of turn
Captain's Claws bring every turn 1 more ally!
Gift of Immortality your dead ally reurns to the battlefield after it has been killed to fight for you one more time and also triggers allies
Mirror Entity finnisher who can make your 0/1, 1/1 creatures for example 5/5. Do not forget you can use Harabaz Druid to help you with mana which you need for it! By the way your creatures still have +1/+1 counters even if they are boosted with Mirror Entity