Abio-Genesis

White and Green creatures you control have
lifelink and enter the battlefield with an
additional +1/+1 counter on them.
At the beginning of each upkeep, create a 1/1
green Saporlings creature token, then proliferate.
If Abio-Genesis would be destroyed, exile it
instead, then double the number of creature
tokens on the battlefield, then proliferate, then proliferate again.