Corpsewood Seer

Deathsight (Whenever a creature you control dies,
scry 1.)
{1}{b}, {t}, Sacrifice a creature: Target creature an opponent controls gets -X/-X until end of turn,
where X is the sacrificed creature's power.
{g}, {t}, Sacrifice a creature: Target creature you control gets +X/+X until end of turn, where X
is the sacrificed creature's power.