I am such a dork. I just wasted a silly amount of time compiling a list of all "Slivers" ever printed in Magic. For those not familiar with Slivers, they are a creature type whose abilities generally affect all other Slivers. Designed to be more powerful in combination with each other than on their own.
I omitted various details. All sliver abilities affect all slivers in play unless otherwise noted. Power and toughness is somewhere between 1/1 and 3/3 unless otherwise noted.
Shifting Sliver - Can't be blocked except by Slivers.
Crystalline Sliver - Cannot be target of spells or abilities.
Ward Sliver - Protection from a chosen color (choose as Ward Sliver comes into play).
Mistform Sliver - 1: Sliver gains additional creature type until end of turn
Victual Sliver - 2, Sacrifice: Gain 4 life.
Acidic Sliver - 2, Sacrifice: Deal 2 damage
Mnemonic Sliver - 2, Sacrifice: Draw a card.
Mindwhip Sliver - 2, Sacrifice: Random Discard
Hibernation Sliver - Pay 2 life: return to owner's hand
Clot Sliver - 2: Regenerate
Horned Sliver - Trample
Talon Sliver - First Strike
Heart Sliver - Haste
Winged Sliver - Flying
Hunter Sliver - Provoke
Toxin Sliver - Venom (no regeneration).
Root Sliver - Can't be countered.
Crypt Sliver - Tap: regenerate target Sliver
Quick Sliver - May play slivers as instants
Essence Sliver - Gain life for damage dealt.
Metallic Sliver (1/1 artifact sliver)
Synapse Sliver - Whenever deals combat damage, controller may draw a card.
Brood Sliver - Whenever deals combat damage, create a 1/1 Sliver token.
Plated Sliver - +0,1
Blade Sliver - +1,0
Barbed Sliver - 2: +1,0
Armor Sliver - 2: +0,1
Spectral Sliver - 2: +1,+1
Spined Sliver - +1,+1 for each blocker
Muscle Sliver - +1,+1
Magma Sliver - gain Tap: Slivers get +X,0 where X is # Slivers in play.
Sliver Queen - 7/7, 2: make a 1/1 colorless Sliver.
Sliver Overlord - 7/7, 3: Search your library for a sliver and put it in your hand. 3: Gain control of target Sliver.
I think they were printed in Tempest, Stronghold, Scourge, and Legions.