you could make a tainted upgrade item that allows you to switch like spin babys to their tainted counter parts maybe more single damage or bursts or group damage without peirce
Good idea! I'm gonna try to think of the tainted counterparts of the four starter familiars you get in the game.
Brother Bobby: Shoots a lot of shoots but nearly no dmg (like soy milk)
Little C.H.A.D. : Produces less hearts but fights back
Cube of Meat: Has less health but splits into weaker Cube of Meats when killed (they dont split into more)
Bob's Brain: Explodes in a bigger range but deals less damage