Sulfuric Plague

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.)
Each player sacrifices X number of permanents
at random. Then, in turn order, each player
tosses a coin X times and calls it. If they call it
right, that player creates a 1/1 black and red
Goblin Zombie creature token. If they call it
wrong, that player loses 2 life.