Nyro, Charming Chancer

Menace, Exploit (When this creature enters the battlefield, you may sacrifice a creature.)
When Nyro, Charming Chancer exploits, target creature gets -X/-X until the end of turn, where
X is the total power of creatures with menace you
control.
When a creature an opponent controls dies, you
may return Nyro, Charming Chancer to your
hand. If you do, create a Treasure token.