Cheapest priced copy (Time Spiral Remastered): $0.35 at Card Kingdom, near mint, their price list as of .
Two-Headed Sliver 
Creature — Sliver · 1/1 · Common · Time Spiral · #183
All Sliver creatures have menace. (They can't be blocked except by two or more creatures.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
4 printings · $0.35 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 883 | Common | $0.49 | — |
| Secret Lair Drop | 646 | Rare | — | $2.29 |
| Time Spiral | 183 | Common | $0.49 | $4.99 |
| Time Spiral Remastered | 197 | Common | $0.35 | $1.99 |
2 rulings from Wizards of the Coast
- 1 July 2013If the creature type of a Sliver changes so it's no longer a Sliver, it will no longer be affected by its own ability. Its ability will continue to affect other Sliver creatures.
- 19 March 2021Multiple instances of menace on the same creature are redundant.