Mr. Mister

When Mr. Mister comes into play, give it 150 charge counters.
Any player can pay {1} to remove a charge counter.
When Mr. Mister has no charge counters, all Mister permanents in the game (and in exile) enter the battlefield under your control. All Mister creatures gain trample, hexproof, indestructible and +X/+X, where X is the number of Misters in play.