Cheapest priced copy (Modern Masters 2017): $0.35 at Card Kingdom, near mint, their price list as of .
Aethertow 
Instant · Common · Shadowmoor · #136
Put target attacking or blocking creature on top of its owner's library.
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
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Masters 2017 | 205 | Common | $0.35 | $0.49 |
| Shadowmoor | 136 | Common | $0.35 | $0.49 |