Quetzacoatl

Flying, Indestructible
Tribute 12 (As this creature enters the battlefield,
an opponent of your choice may place twelve
+1/+1 counters on this creature)
When Quetzalcoatl enters the battlefield, if
tribute wasnt payed, each opponent sacrifices all creatures he or she controls and Quetzacoatl gets
X +1/+1 counters, where X is the number of creatures sacrificed this way.