Gideon's Phalanx is a rare Instant card from Magic Origins Promos (PORI), collector number 14s. Current market price: — (foil $0.49), TCGplayer market prices via Scryfall.
Create four 2/2 white Knight creature tokens with vigilance. Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, creatures you control gain indestructible until end of turn.