Memory Sluice is a common Sorcery card from Shadowmoor (SHM), collector number 170. Current market price: $0.41 (foil $2.22), TCGplayer market prices via Scryfall.
Target player mills four cards. Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy.)