Striking Sliver

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

Predatory Sliver

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

Sliver creatures you control have haste. (They can attack and {T} as soon as they come under your control.)

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

All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it." (It must survive the damage to get the counter.)

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

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