"Fascinating . . . These creatures display the paradox of tenacity and purposed self-destruction I have sought to breed into my thrulls."
—Endrek Sahr, master breeder

Basal Sliver

All Slivers have "Sacrifice this permanent: Add {B}{B}."

Secret Lair Drop

Time Spiral

All Slivers have "Sacrifice this creature: Add {B}{B} to your mana pool."

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.