Leeching Sliver

Whenever a Sliver you control attacks, defending player loses 1 life.

Taunting Sliver

Sliver creatures you control have "When this creature enters, goad target creature an opponent controls." (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

Slither Blade

Shifting Sliver

Slivers can't be blocked except by Slivers.

Changeling Outcast

Changeling (This card is every creature type.)
Changeling Outcast can't block and can't be blocked.

Hibernation Sliver

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

Vampiric Sliver

All Sliver creatures have "Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."

Toxin Sliver

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

Galerider Sliver

Sliver creatures you control have flying.

Jon Irenicus, Shattered One

At the beginning of your end step, target opponent gains control of up to one target creature you control. Put two +1/+1 counters on it and tap it. It's goaded for the rest of the game and it gains "This creature can't be sacrificed." (It attacks each combat if able and attacks a player other than you if able.)
Whenever a creature you own but don't control attacks, you draw a card.

Plague Sliver

All Slivers have "At the beginning of your upkeep, this permanent deals 1 damage to you."

Winged Sliver

Spitting Sliver

Assault Suit

Equipped creature gets +2/+2, has haste, can't attack you or planeswalkers you control, and can't be sacrificed.
At the beginning of each opponent's upkeep, you may have that player gain control of equipped creature until end of turn. If you do, untap it.
Equip {3}

Shadow Sliver

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