Cheapest priced copy (Time Spiral): $0.59 at Card Kingdom, near mint, their price list as of .
Basal Sliver 
Creature — Sliver · 2/2 · Common · Time Spiral · #96
All Slivers have "Sacrifice this permanent: Add {B}{B}."
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.59 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Secret Lair Drop | 629 | Rare | — | $2.49 |
| Time Spiral | 96 | Common | $0.59 | $11.99 |
2 rulings from Wizards of the Coast
- 1 July 2013Abilities that Slivers grant, as well as power/toughness boosts, are cumulative. However, for some abilities, like flying, having more than one instance of the ability doesn’t provide any additional benefit.
- 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.