Essence Sliver

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

Horned Sliver

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

All Slivers have "Pay 2 life: Return this permanent to its owner's hand."

Slivers can't be blocked except by Slivers.

All Slivers have shroud. (They can't be the targets of spells or abilities.)

All Slivers have "{2}: Regenerate this permanent."

As Ward Sliver enters, choose a color.
All Slivers have protection from the chosen color.

All Slivers have "{T}: Regenerate target Sliver."

Whenever a Sliver deals combat damage to a creature, destroy that creature. It can't be regenerated.

This spell can't be countered.
Sliver spells can't be countered.

All Sliver creatures have "{2}: This creature gets +0/+1 until end of turn."

Activated abilities of creatures cost {1} less to activate. This effect can't reduce the mana in that cost to less than one mana.

All Sliver creatures have "{2}: This creature gets +1/+1 until end of turn."

All Slivers have "{2}, Sacrifice this permanent: Target player discards a card at random. Activate only as a sorcery."