Hypno, Eater of Dreams

{t}: Put 3 sleep counters on target creature an
opponent controls.

{3}{b}{b}: Destroy target creature with a sleep
counter on it. Hypno gets +X/+X until end of turn,
where X is equal to that creatures power unless its controller discards X cards. Then you gain life equal
to that creatures toughness unless its controller loses
that much life.