Summoning Materia is a rare Artifact — Equipment card from Final Fantasy Commander (FIC), collector number 124. Current market price: $0.40 (foil $1.13), TCGplayer market prices via Scryfall.
You may look at the top card of your library any time. As long as this Equipment is attached to a creature, you may cast creature spells from the top of your library. Equipped creature gets +2/+2 and has vigilance and "{T}: Add {G}." Equip {2}