Teyo, Diamondblade Mage is a uncommon Legendary Creature — Human Warlock card from Reality Fracture (FRA), collector number 236. Current market price: $0.18 (foil $0.29), TCGplayer market prices via Scryfall.
Flash When Teyo enters, target permanent you control gains deathtouch until end of turn. Put a +1/+1 counter on it if it's a creature. Put a loyalty counter on it if it's a planeswalker.