The Awaited Destroyer

Begin the game with this card revealed.
During your upkeep you get a doom counter,
and when you lose life (for each instance) or
are attacked.
During your end step, if you have 40 or more
doom counters, create a 40/40 black artifact
Horror, deathtouch, trample, indestructible,
can block any number of creatures. (control
cannot change and it can't leave the battlefield.)