Aezhal, Primal Dusk

Trample, Flying, Indestructible, Vigilance
Aezhal, Primal Dusk costs X less to cast where X
is the number of dinosaurs and/ or dragons you control.
When Aezhal, Primal Dusk enters the battlefield, if you payed {10}, or lower, put a +3/+3 counter on each creature you control.
The mountains cracks and the earth splits.