Mount Doom

In your first turn's upkeep, put Mount Doom
directly onto the battlefield tapped.

{t}: Add {b}{r} to your mana pool.

Destroy the Ring — The ringbearer rolls 1D20
if is on your battlefield at your end step. If rolls
less than the ring counters, the ringbearer is exiled
and you create a 2/2 Ring Wraith. If rolls 16 or
more, The One Ring and Sauron are destroyed.
Evil loses the game.