Gearwork Drifter

Flying, Protection against Artifacts.
Whenever a creature you control blocks or is
blocked by an Artifact Creature, that creature
gains "When this creature is destroyed create a
1/1 white Spirit token" till the end of the turn.
{w/u}{w/u}{g/w}{g/w}, sacrifice Gearwork Drifter:
Create an X/X blue/green Spirit token, where
X is the number of spirits you control.