Cheapest priced copy (Magic 2015): $0.49 at Card Kingdom, near mint, their price list as of .
Belligerent Sliver 
Creature — Sliver · 2/2 · Uncommon · Magic 2015 · #129
Sliver creatures you control have menace. (They can't be blocked except by two or more creatures.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2015 | 129 | Uncommon | $0.49 | $2.99 |
| Secret Lair Drop | 636 | Rare | — | $1.49 |
3 rulings from Wizards of the Coast
- 18 July 2014Abilities that Slivers grant, as well as power/toughness boosts, are cumulative. However, for some abilities, like indestructible and the ability granted by Belligerent Sliver, having more than one instance of the ability doesn’t provide any additional benefit.
- 18 July 2014If 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.
- 18 July 2014Slivers in this set affect only Sliver creatures you control. They don’t grant bonuses to your opponents’ Slivers. This is the same way Slivers from the Magic 2014 core set worked, while Slivers in earlier sets granted bonuses to all Slivers.