"We are kinfolk," explained Karn to the sliver queen. "Just as you need your progeny to complete you, so do I need the pieces of the Legacy to make me whole."

Victual Sliver

All Slivers have "{2}, Sacrifice this permanent: You gain 4 life."

Tempest Remastered

Premium Deck Series: Slivers

Stronghold

Each Sliver gains "o2, Sacrifice this creature: Gain 4 life."

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.