Ondos, Primal Emperor

Devour 2(As this creature enters the battlefield, you may sacrifice any number of creatures. If you do, put 2 +1/+1 counters on this creature for each creature sacrificed this way.)
When Ondos, Primal Emperor enters the battlefield, exert X target creatures and all zombie dinosaurs and Necrosaurs. They have
-X/-X and lose hexproof and indestructible.
Hexproof, Indestructible, Trample, Haste, Firststrike, Lifelink, Reach.
Wurm spells you cast cost {10} less to cast.