Cham, Healer of Many Forms

Mutate {1}{w}
Changeling (This creature has every creature type)
Whenever you gain life, you may pay {x} where X
is less than or equal to the amount of life gained.
If you do, distribute X +1/+1 counters among
any number of creatures you control.
Whenever this creature mutates, you gain 1 life
for each creature you control.