Cheapest priced copy (Commander Masters): $7.49 at Card Kingdom, near mint, their price list as of .
Bonescythe Sliver 
Creature — Sliver · 2/2 · Rare · Magic 2014 · #9
Sliver creatures you control have double strike. (They deal both first-strike and regular combat damage.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $7.49 to $84.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 815 | Rare | $7.49 | — |
| Magic 2014 | 9 | Rare | $7.99 | $8.99 |
| Duels of the Planeswalkers 2014 Promos | 1 | Rare | — | $9.99 |
| Secret Lair Drop | 610 | Rare | — | $84.99Out of stock |
3 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 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 2013If Bonescythe Sliver leaves the battlefield after other Sliver creatures you control have dealt first-strike damage but before regular combat damage, those Slivers won’t deal regular combat damage (unless they still have double strike for some other reason).