Cataclygauros

During each of your turns, you gain 1 summon counter. When you have 20 summon counters,
you may cast Cataclygauros without paying its
mana cost. Cataclygauros enters the battlefield
with 20 time counters. During each of your turns,
remove 1 time counter. Cataclygauros leaves the
battlefield once all 20 time counters are
removed. Cataclygauros has Indestructible,
Islandwalk, Menace, and Trample as long as
there are 10 or more cards in your graveyard.