Cans of Instant Sunshine

Hexproof, indestructible
Cans of Instant Sunshine enters the battlefield
with half X time counters, rounded up. At the beginning of each upkeep, remove a time
counter. When the number of time counters on
Cans of Instant Sunshine reaches 0, Cans of
Instant Sunshine deals X damage to each
opponent and destroys all permanents in play, including anything with indestructible.
When played, X must be superior to 20.