Cheapest priced copy (Tempest): $0.35 at Card Kingdom, near mint, their price list as of .
Mindwhip Sliver 
Creature — Sliver · 2/2 · Uncommon · Tempest · #145
All Slivers have "{2}, Sacrifice this permanent: Target player discards a card at random. Activate only as a sorcery."
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tempest | 145 | Uncommon | $0.35 | — |
4 rulings from Wizards of the Coast
- 15 April 2013If you cast this as normal during your main phase, it will enter the battlefield and you’ll receive priority. If no abilities trigger because of this, you can activate its ability immediately, before any other player has a chance to remove it from the battlefield.
- 15 April 2013If you cast a Sliver as normal during your main phase, it will enter the battlefield and you’ll receive priority. If no abilities trigger because of this, you can activate its ability immediately, before any other player has a chance to remove it from the battlefield.
- 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 the creature type of a Sliver changes 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.