Gwyllion Hedge-Mage is a uncommon Creature — Hag Wizard card from The List (PLST), collector number CMA-201. Current market price: $0.31, TCGplayer market prices via Scryfall.
When this creature enters, if you control two or more Plains, you may create a 1/1 white Kithkin Soldier creature token. When this creature enters, if you control two or more Swamps, you may put a -1/-1 counter on target creature.