Grand Wizard Cartman

Convoke (Your creatures can help cast this spell.
Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Sacrifice a Human: Grand Wizard Cartman deals
2 damage to any target.
{p/w}{p/u}{p/b}{p/r}{p/g}: Tap up to X target creatures you
don't control, where X is the number of
opponents.