Garrison Trove

When Garisson Trove enters the battlefield, flip
a coin; if heads all players must exile their
graveyards; if tails, all players must put the top X
cards of their library into the graveyard where
X is the number of cards in your exile.
{3}, {t}, sacrifice Garisson Trove: target player
discards their hand, you draw cards equal to
the number of cards in their hand.