Stormcatch Mentor is a uncommon Creature — Otter Wizard card from Bloomburrow (BLB), collector number 385. Current market price: $1.79 (foil $5.27), TCGplayer market prices via Scryfall.
Haste Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) Instant and sorcery spells you cast cost {1} less to cast.