Muscle Sliver
All Sliver creatures get +1/+1.
The air was filled with the cracks and snaps of flesh hardening as the new sliver joined the battle.
Illustrated by Richard Kane Ferguson
This printing
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Abilities 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.
If 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.
Muscle Sliver's ability does give itself +1/+1.
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Sliver may become lethal if Muscle Sliver leaves the battlefield during that turn.
