Umara Entangler is a common Creature — Merfolk Rogue Ally card from Oath of the Gatewatch (OGW), collector number 65. Current market price: $0.06 (foil $0.08), TCGplayer market prices via Scryfall.
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)