The Chosen one

First strike, Hexproof
When the Chosen one enters the battlefield. destroy two target creatures an opponent controls. The Chosen one gets X +1/+1 counters where X is the total amount of toughness of those creatures.
Whenever a creature is killed of destroyed by The Chosen one. Return it to the battlefield under your control.
When The Chosen one is killed or destroyed, deal 15 damage to it's controller.