Cheapest priced copy (Shadowmoor): $0.79 at Card Kingdom, near mint, their price list as of .
Memory Sluice 
Sorcery · Common · Shadowmoor · #170
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.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.79 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadowmoor | 170 | Common | $0.79 | $3.49 |