The Bowl Ripper

0: Attacking creatures you control have +3/-1. If 5 or more creatures you control blocked this turn, transform The Bowl Ripper with half his life
0: Until your next upkeep, when a creature attacks, target opponent reveals the top card of their library and a Leader they control loses 1 life.
-8: Creatures must block this turn if able. Damage can't be prevented this turn.