Conduit of Ruin [Battle for Zendikar Prerelease Promos]Set: Battle for Zendikar Prerelease Promos Type: Creature Eldrazi Rarity: Rare Cost: {6} When you cast this spell, you may search your library for a colorless creature card with converted mana cost 7 or greater, reveal it, then shuffle your library and put that card on top of it. The first creature spell you cast each turn costs {2} less to cast.