Cheapest priced copy (Time Spiral): $0.49 at Card Kingdom, near mint, their price list as of .
Vampiric Sliver 
Creature — Sliver · 3/3 · Uncommon · Time Spiral · #140
All Sliver creatures have "Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.49 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Time Spiral | 140 | Uncommon | $0.49 | $4.99 |
5 rulings from Wizards of the Coast
- 25 September 2006If Vampiric Sliver is put into a graveyard from the battlefield at the same time as a creature dealt damage by another Sliver, the Vampiric Sliver’s ability will trigger for the other Sliver. That Sliver will get a +1/+1 counter.
- 25 September 2006If a Sliver doesn’t have this ability when it deals damage, but does have it when the damaged creature is put into a graveyard, the ability will trigger.
- 25 September 2006If a Sliver has this ability when it deals damage, but not when the damaged creature is put into a graveyard, nothing happens.
- 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.
- 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.