Syr Cadian, Knight Owl is a rare Legendary Creature — Bird Knight card from Unsanctioned (UND), collector number 15. Current market price: $0.24, TCGplayer market prices via Scryfall.
Knightlifelink (Damage dealt by Knights you control also causes you to gain that much life.) {W}: Syr Cadian gains vigilance until end of turn. Activate only from sunrise to sunset. {B}: Syr Cadian gains flying until end of turn. Activate only from sunset to sunrise.