Sliver creatures you control get +2/+0.

Whenever a Sliver deals damage, its controller gains that much life.

Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token.

Hellbent — As long as you have no cards in hand, Sliver creatures you control have "{T}: This creature deals 1 damage to target player or planeswalker."

Sliver creatures you control have indestructible. (Damage and effects that say "destroy" don't destroy them.)

Outlast {2} ({2}, {T}: Put a +1/+1 counter on this creature. Outlast only as a sorcery.) Other Sliver creatures you control have outlast {2}.

All Sliver creatures get +1/+1.

Sliver creatures you control have flying and haste.

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

({T}: Add {B}.)

Each Sliver creature card in your graveyard has unearth {2}. Unearth {2} ({2}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)