Winged Sliver

Two-Headed Sliver

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

All Sliver creatures have frenzy 1. (Whenever a Sliver attacks and isn't blocked, it gets +1/+0 until end of turn.)

All Sliver creatures have "{2}: This creature gets +0/+1 until end of turn."

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

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

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

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