Symbol of the Rainbow Order

{1}{c},{t}: Create a 0/1 colorless Colorful Spawn
creature token with “Sacrifice this creature: Add {c} ."
Whenever another Rainbow Creature you control
dies, put a +1/+1 counter on Symbol of the Rainbow
Order.

As long as Symbol of the Rainbow Order has eight
or more +1/+1 counters on it, it’s a 0/0 creature in addition to its other types and it has annihilator 2.