Spellweaver Helix is a rare Artifact card from Mirrodin (MRD), collector number 247. Current market price: $2.92 (foil $16.66), TCGplayer market prices via Scryfall.
Imprint — When this artifact enters, you may exile two target sorcery cards from a single graveyard. Whenever a player casts a card, if it has the same name as one of the cards exiled with this artifact, you may copy the other. If you do, you may cast the copy without paying its mana cost.