Venom Sliver

Sliver creatures you control have deathtouch. (Any amount of damage a creature with deathtouch deals to a creature is enough to destroy it.)

Gemhide Sliver

All Slivers have "{T}: Add one mana of any color."

{T}: Add one mana of any color in your commander's color identity.

Sliver creatures you control have vigilance. (Attacking doesn't cause them to tap.)

Sliver creatures you control have "{T}: Add one mana of any color."

All Slivers have "When this permanent enters, destroy target artifact or enchantment."

Indestructible (Effects that say "destroy" don't destroy this artifact.)
{T}: Add one mana of any color.

Sliver creatures you control have indestructible. (Damage and effects that say "destroy" don't destroy them.)

{T}: Add one mana of any color in your commander's color identity.
Sacrifice Commander's Sphere: Draw a card.