mtg cards like act of treason - Jumpstart Gain control of target creature until end of turn Act of Treason (Card) |

Suki is probably my favorite here since her power is equal to the number of creatures you control (and well wind up with a lot of warrior creature tokens)

If you want more specific Boros brews, the color pair works well with equipment cards and soldiertypal cards to build decks leaning on synergy instead of sheer efficiency

I'll pass the baton off to Mark who will be covering the Azorius guild

Poor Shambling Vent

Once an Assassin creature or commander you control deals combat damage to a player in a turn, you can cast spells for their freerunning costs for the rest of that turn

Modern Horizons 2 had a black-green Squirrel typal archetype