Telekinetic Sliver

All Slivers have "{T}: Tap target permanent."

Fungus Sliver

All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it." (It must survive the damage to get the counter.)

Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."

Sliver creatures you control have "Whenever this creature is dealt damage, it deals that much damage to target player or planeswalker."

All Sliver creatures have shadow. (They can block or be blocked by only creatures with shadow.)

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

All Slivers have "{1}: This permanent becomes the creature type of your choice in addition to its other types until end of turn."