Leo, Quantum Manipulator

Leo, Quantum Manipulator has hexproof as long
as it is untapped.
Whenever Leo, Quantum Manipulator becomes
blocked, you may have it assign no combat
damage this combat. If you do, you may pay {x} for each creature blocking it to give
that creature -X/-X until the end of the turn.
{x}{b}{b}{t}, Sacrifice a creature: Target opponent
loses X life. X cannot be greater than the
sacrificed creature's power.