HOLY MACKEREL

indestructibility
(As long as your devotion of green and
blue is less then seven HOLY MACKEREL
isn't a creature) each upkeep create a 0/1 fish
with shroud
{2}{u}{u}{u}{u}{u}{g}{g}{g} create a 0/0
legendary creature fish named fish swarm
with when this creature enters the
battlefield it gets +1/+1 for each fish
you control