Gemhide Sliver

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

Cloudshredder Sliver

Sliver creatures you control have flying and haste.

All Sliver creatures have menace. (They can't be blocked except by two or more creatures.)

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

Sliver creatures you control have double strike. (They deal both first-strike and regular combat damage.)

All Slivers have shroud. (They can't be the targets of spells or abilities.)

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

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

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

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

Flash
Any player may cast Sliver spells as though they had flash.

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