Cheapest priced copy (Commander Masters): $5.49 at Card Kingdom, near mint, their price list as of .
Brood Sliver 
Creature — Sliver · 3/3 · Rare · Legions · #120
Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $5.49 to $44.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 887 | Rare | $5.49 | — |
| Premium Deck Series: Slivers | 22 | Rare | — | $6.49 |
| Legions | 120 | Rare | $6.99 | $44.99 |
| Salvat 2005 | D13 | Rare | — | — |
| Secret Lair Drop | 647 | Rare | — | $5.49 |
3 rulings from Wizards of the Coast
- 4 October 2004This card’s controller controls the triggered ability, but the controller of the Sliver that deals damage to a player decides whether or not to put the token onto the battlefield under their control.
- 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.