Cheapest priced copy (Secret Lair Drop): $5.99 at Card Kingdom, foil, near mint, their price list as of .
Magma Sliver 
Creature — Sliver · 3/3 · Rare · Legions · #107
All Slivers have "{T}: Target Sliver creature gets +X/+0 until end of turn, where X is the number of Slivers on the battlefield."
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $5.99 to $49.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Legions | 107 | Rare | $6.49 | $49.99 |
| Salvat 2005 | D1 | Rare | — | — |
| Secret Lair Drop | 641 | Rare | — | $5.99 |
2 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 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.