Grinning Grave Virus

Trap(While in Foretell, this spell may be cast at
instant speed.)
Foretell {u}
Sacrifice a creature with the greatest power, then
target opponent reveals their hand. Put one creature
with power equal to or less than the sacrificed ones
from their hand, or battlefield, into their graveyard.
If this was cast on an opponents turn, then you may
put up to two creatures into their graveyard instead.