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.)

Hibernation Sliver

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."

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

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

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

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