Thoughtbound Phantasm is a uncommon Creature — Spirit card from Guilds of Ravnica (GRN), collector number 55. Current market price: $0.24 (foil $0.40), TCGplayer market prices via Scryfall.
Defender Whenever you surveil, put a +1/+1 counter on this creature. As long as this creature has three or more +1/+1 counters on it, it can attack as though it didn't have defender.