Conduit of Ruin is a rare Creature — Eldrazi card from Battle for Zendikar Promos (PBFZ), collector number 4s. Current market price: — (foil $27.69), TCGplayer market prices via Scryfall.
When you cast this spell, you may search your library for a colorless creature card with mana value 7 or greater, reveal it, then shuffle and put that card on top. The first creature spell you cast each turn costs {2} less to cast.