Busy Bird Feeder

Busy Bird Feeder enters the battlefield with
4 wait counters on it. During your upkeep
remove a wait counter from Busy Bird Feeder. When a counter is removed from Busy Bird Feeder, put a 1/1 blue Bird creature token with
flying onto the battlefield. When all counters
have been removed from Busy Bird Feeder, sacrifice it and put 3 Bird tokens and a 1/1
green Squirrel token onto the battlefield.