Bonescythe Sliver

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

Galerider Sliver

Sliver creatures you control have flying.

Sliver creatures you control have trample. (A creature with trample can deal excess combat damage to the player or planeswalker it's attacking.)

Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token.

Whenever a Sliver becomes blocked, that Sliver gets +1/+1 until end of turn for each creature blocking it.

Whenever a Sliver deals combat damage to a creature, destroy that creature. It can't be regenerated.

All Slivers have shroud. (They can't be the targets of spells or abilities.)

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.)

All Sliver creatures get +1/+1 for each other Sliver on the battlefield.

This spell can't be countered.
Destroy all creatures.

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