Zhishui Shun, Yuan Qui Elder

Eminence - As long as Zhishui Shun, Yuan Qui Elder is in the command zone or on the battlefield, other Snake creatures you control get +2/+2.
Whenever a creature your opponent controls dies, you may pay {x}, where X was that creature's converted mana cost. Then, return target Snake creature with converted mana cost
X from your graveyard to the battlefield tapped.