Cheapest priced copy (Time Spiral): $0.59 at Card Kingdom, near mint, their price list as of .
Fungus Sliver 
Creature — Fungus Sliver · 2/2 · Rare · Time Spiral · #195
All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it." (It must survive the damage to get the counter.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.59 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Premium Deck Series: Slivers | 21 | Rare | — | $1.29 |
| Time Spiral | 195 | Rare | $0.59 | $3.99 |
| Time Spiral Remastered | 203 | Rare | $0.59 | $0.79 |
3 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.
- 19 March 2021If multiple sources deal damage to a Sliver at the same time and that Sliver survives the damage, it gets only one +1/+1 counter despite its impressive efforts.