Dao, The Voidless Life

Flying, indestructible
Whenever you cast a non-creature spell put two
warp counters on Dao, The Voidless Life.
—At the beginning of each endstep, remove all
warp counters from Dao. If two warp counters
were removed deal 5 damage to any target. If
four were removed, destroy all creatures. If six
were removed, destroy all non-land permanents;
and if ten or more were removed target player
loses the game.