Flockchaser Phantom is a rare Creature — Spirit card from March of the Machine Commander (MOC), collector number 128. Current market price: $0.30, TCGplayer market prices via Scryfall.
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Flying, vigilance Whenever this creature attacks, the next spell you cast this turn has convoke.