Viserion, the forest guardian

Flying, trample, proteccion from multicolored
When Viserion, the forest guardian entrs the battlefield you gain life equal to the number of
non-human creatures you control.
Whenever you cast a non-human creature put
a +1 +1 counter on Viserion
Non-human creatures cost {1} less to cast for
each +1 +1 counter on Viserion