Armageddon Hydra

Indestructible
When Armageddon Hydra enters the battlefield, destroy all creatures with toughness 3 or less.
Armageddon Hydra enters the battlefield with 10 time counters on it. Remove a time counter at the beginning of your end step. When Armageddon Hydra has no time counters on it, sacrifice it and destroy all permanents on the battlefield.