Secret Lair Drop

Sliver Hive

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast a Sliver spell.
{5}, {T}: Create a 1/1 colorless Sliver creature token. Activate only if you control a Sliver.

Jumpstart: Historic Horizons

Magic 2015

{T}: Add {1} to your mana pool.
{T}: Add one mana of any color to your mana pool. Spend this mana only to cast a Sliver spell.
{5}, {T}: Put a 1/1 colorless Sliver creature token onto the battlefield. Activate this ability only if you control a Sliver.