Enslaved Carver

Whenever Enslaved Carver enters the battlefield,
create a colorless Jack-O-Lantern artifact token
with "Remove a candy counter: Add one mana of
any color to your mana pool. Use this mana only
to cast Squashling creature spells."
Whenever you cast a Squashling creature spell,
put a candy counter on target Jack-O-Lantern
artifact that you control.