Cheapest priced copy (Time Spiral): $0.35 at Card Kingdom, near mint, their price list as of .
Watcher Sliver 
Creature — Sliver · 2/2 · Common · Time Spiral Remastered · #49
All Sliver creatures get +0/+2.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Time Spiral | 45 | Common | $0.35 | $1.49 |
| Time Spiral Remastered | 49 | Common | $0.35 | $0.49 |
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 2021Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to another Sliver may become lethal if Watcher Sliver leaves the battlefield during that turn.