Winged Sliver

Predatory Sliver

All Slivers have "{T}: Regenerate target Sliver."

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

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

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

All Slivers have "{1}, Sacrifice this permanent: Each player discards a card."

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.

All Sliver creatures have shadow. (They can block or be blocked by only creatures with shadow.)