Monstrous Crustacean

Hexproof, Islandwalk
Whenever an Island enters the battlefield under your control, Monstrous Crustacean gets +X/+X until end of turn, where x is the amount of Islands on the battlefield. {x}{x}{x}{u}{u},{t}: create x Island tokens that have '{t}: Add {u} to your mana pool', where x is less than or equal to Monstrous Crustacean's power. Monstrous Crustacean's power and toughness are both equal to the amount of Islands on the battlefield