Cheapest priced copy (Magic 2014): $0.99 at Card Kingdom, near mint, their price list as of .
Thorncaster Sliver 
Creature — Sliver · 2/2 · Rare · Magic 2014 · #158
Sliver creatures you control have "Whenever this creature attacks, it deals 1 damage to any target."
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.99 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2014 | 158 | Rare | $0.99 | $2.49 |
| Secret Lair Drop | 645 | Rare | — | $2.29 |
3 rulings from Wizards of the Coast
- 1 July 2013If you control multiple Thorncaster Slivers and a Sliver you control attacks, each ability will trigger separately.
- 1 July 2013If you change the creature type of a Sliver you control 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 you control.
- 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.