The Pale Dragon

The Pale Dragon can not be blocked. Flying
Whenever the Pale Dragon would deal combat
damage to a player, prevent that damage and they
gain that many damage counters.
Damage Counters- At the beginning of each end step,
if a player has damage counters, they may choose to
take 2 damage for each damage counter and lose all
damage counters. Then, if they have 21 or more
damage counters, they lose the game.