Azathoth, the Nuclear Chaos

Cannot be countered, indestructible, shroud
Azathoth, the Nuclear Chaos enters the
battlefield with 20 Time counters on it. At the beginning of each upkeep, remove a Time
counter from it. Then, if there are no Time
counters on it, all players lose the game. If
damage would be dealt to Azathoth, the Nuclear Chaos, instead remove that many Time counters
from it.