Zelotropes Zragon

Flying, Swampwalk, Lifelink
Whenever Zelotropes attacks, you may destroy target creature with toughness 4 or less, if you do, put a 5/5 Zragon creature token on the battlefield tapped with Flying and "whenever this creature enters the graveyard, Return it to the battlefield tapped"
Whenever Zelotropes Enters the graveyard, return it to the battlefield tapped