Rabbit King

Whenever you play an artifact or enchantment card while Rabbit King is on the battlefield, put a 1/1 Green, Beast "Rabbit" creature token onto the battlefield.
Whenever your opponent plays an artifact or enchantment card while Rabbit King is on the battlefield, choose and sacrifice a "Rabbit" token if any.
When Rabbit King leaves the battlefield for any reason, put a number of poison counters on target player equal to the number of "Rabbit" tokens on the battlefield.