Two-Headed Sliver

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

Blade Sliver

Magma Spray

Magma Spray deals 2 damage to target creature. If that creature would die this turn, exile it instead.

Blinding Flare

Strive — This spell costs {R} more to cast for each target beyond the first.
Any number of target creatures can't block this turn.

Fury Sliver

Titan's Strength

Target creature gets +3/+1 until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Battering Sliver

Bonesplitter Sliver

Searing Spear

Searing Spear deals 3 damage to any target.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Hunter Sliver

All Sliver creatures have provoke. (Whenever a Sliver attacks, its controller may have target creature defending player controls untap and block it if able.)

Mountain

Coordinated Assault

Up to two target creatures each get +1/+0 and gain first strike until end of turn. (They deal combat damage before creatures without first strike.)