Conduit of Ruin is a rare Creature — Eldrazi card from Battle for Zendikar (BFZ), collector number 4. Current market price: $5.97 (foil $13.29), 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.