Haunter

Toxic 1

{u}{t}: Tap target creature.

{b}{t}: Roll a D6. Place -1/-1 counters equal to the result on target tapped creature. If the tapped creature dies, gain life equal to the number of -1/-1 counters on that creature when it died.

Evolve - Trade - target opponent picks another creature
you control other than Haunter. Sacrifice that creature. Transform Haunter.