Conduit of Worlds is a rare Artifact card from Tarkir: Dragonstorm Commander (TDC), collector number 251. Current market price: $2.99, TCGplayer market prices via Scryfall.
You may play lands from your graveyard. {T}: Choose target nonland permanent card in your graveyard. If you haven't cast a spell this turn, you may cast that card. If you do, you can't cast additional spells this turn. Activate only as a sorcery.