Eradicator Epidemic Virus

Trap(While in Foretell, this spell may be cast at
instant speed.)
Foretell {b}
Sacrifice a creature with 4 or more toughness, then
target opponent reveals their hand. Put one creature
with power 4 or less from their hand, or battlefield,
into their graveyard. If this was cast on an
opponents turn, then you may put up to three
creatures into their graveyard instead.