Sentinel Sliver

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

Cleaving Sliver

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

Sliver creatures you control have first strike. (They deal combat damage before creatures without first strike.)

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

Sliver creatures you control have "Whenever this creature attacks, it deals 1 damage to any target."

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

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

Sliver creatures you control have flying and haste.