Citadel Castellan is a uncommon Creature — Human Knight card from Magic Origins (ORI), collector number 213. Current market price: $0.09 (foil $0.40), TCGplayer market prices via Scryfall.
Vigilance (Attacking doesn't cause this creature to tap.) Renown 2 (When this creature deals combat damage to a player, if it isn't renowned, put two +1/+1 counters on it and it becomes renowned.)