Krozek, the Reborn

Krozek, the Reborn enters the battelfield
with {x} +1/+1 equal to the mana cost
used for cast this spell multiplied for two.
Each Snake, Bird, Beast and God gets
+2/+2 as long as Krozek, the Reborn
remains on the battelfield.
"Only the Nature can decide the future of
this World."