Neo, From Frost

Synchronized — Sacrifice a blue and a white
creature. (You can cast this card from outside the
game if you pay the synchronized cost as an additional
cost to cast this spell. You can only cast this card from
outside the game.)
This creature gets +1/+1 for each other blue
creature on the battlefield. When this creature
leaves the battlefield, exile it; when you do
destroy all creatures on the battlefield.