Galerider Sliver

Sliver creatures you control have flying.

Leeching Sliver

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

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

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

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 vigilance. (Attacking doesn't cause them to tap.)