"Their appendages are sharper than our swords and quicker than our bows."
—Hastric, Thunian scout

Bonescythe Sliver

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

"It seems docile enough. Perhaps we could train it to reap the grain—it would be the easiest harvest season of our lives!"
—Georgina, farmer, now deceased

Commander Masters

Sliver creatures you control have double strike.

Secret Lair Drop

Jumpstart: Historic Horizons

Magic 2014

Duels of the Planeswalkers 2014 Promos

Abilities that Slivers grant, as well as power/toughness boosts, are cumulative. However, for some abilities, like flying, having more than one instance of the ability doesn’t provide any additional benefit.

If Bonescythe Sliver leaves the battlefield after other Sliver creatures you control have dealt first-strike damage but before regular combat damage, those Slivers won’t deal regular combat damage (unless they still have double strike for some other reason).

If you change the creature type of a Sliver you control so it’s no longer a Sliver, it will no longer be affected by its own ability. Its ability will continue to affect other Sliver creatures you control.