Grakei, Avatar of Chaos

Flying
This spell can't be countered.
When Grakei, Avatar of Chaos enters the
battlefield, create X 0/1 red and blue Chaos wisp
creature tokens. It has "Sacrifice this creature:
Add 1d6 to the power and toughness of target
dragon until your next turn."
Grakei, Avatar of Chaos enters the battlefield
with 1d6 +1/+1 counters on it for every four
mana spent to cast it.