Cheapest priced copy (Magic 2014): $0.35 at Card Kingdom, near mint, their price list as of .
Striking Sliver 
Creature — Sliver · 1/1 · Common · Commander Masters · #882
Sliver creatures you control have first strike. (They deal combat damage before creatures without first strike.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $54.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 882 | Common | $3.49 | — |
| Magic 2014 | 157 | Common | $0.35 | $4.99 |
| Secret Lair Drop | 644 | Rare | — | $54.99 |
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 Striking Sliver leaves the battlefield after Sliver creatures you control have dealt first-strike damage but before regular combat damage, those Slivers won’t deal regular combat damage (unless they have double strike for some reason).
- 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.