Wingnut, Bat on the Belfry Foil

Legendary Creature — Bat Mutant

Alliance — Whenever another creature you control enters, Wingnut gains your choice of flying, menace, or haste until end of turn. Whenever Wingnut attacks, each other attacking creature gets +1/+0 until end of turn.

"Tell me, Screwloose, aren't we good? Mmhm. So, wouldn't that make them evil? Right!"