Cheapest priced copy (Magic 2014): $0.35 at Card Kingdom, near mint, their price list as of .
Blur Sliver 
Creature — Sliver · 2/2 · Common · Commander Masters · #873
Sliver creatures you control have haste. (They can attack and {T} as soon as they come under your control.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $89.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 873 | Common | $0.49 | — |
| Magic 2014 | 129 | Common | $0.35 | $4.49 |
| Secret Lair Drop | 637 | Rare | — | $89.99Out of stock |
3 rulings from Wizards of the Coast
- 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 Blur Sliver leaves the battlefield during combat, any attacking Sliver creatures that came under your control this turn will continue to attack, even though they will no longer have haste.
- 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.