Munda's Vanguard is a rare Creature — Kor Knight Ally card from Oath of the Gatewatch (OGW), collector number 29. Current market price: $0.35 (foil $0.43), TCGplayer market prices via Scryfall.
Cohort — {T}, Tap an untapped Ally you control: Put a +1/+1 counter on each creature you control.