Colossal

As an additional cost to cast this creature, sacrifice a creature you control
Menace, Flying, Intimidate, Acid Blood 3, Vigilance
{t}{p/w}{p/u}{p/r}{p/g}{p/g}{p/r}{p/u}{p/w} Rainbow Blast: Deal 8 damage to target creature; or deal 4 damage to target player or planeswalker