Elesh Norn

{t}{p/w}{x} incubate X times
When Elesh Norn enters the battlefield,you may
pay {p/c}{p/c}{p/w}{p/c}{p/c}, for each 2 life payed this way
put a completion counter on Elesh Norn.
For each completion counter onElesh Norn creatures you control get +X/+X and
creatures your opponent(s) control
get -X/-X.