Detritivore's power and toughness are each equal to the number of nonbasic land cards in your opponents' graveyards.
. X can't be 0. (Rather than cast this card from your hand, you may pay
and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)
Whenever a time counter is removed from Detritivore while it's exiled, destroy target nonbasic land.