Sentinel Sliver

Sliver creatures you control have vigilance. (Attacking doesn't cause them to tap.)

Plains

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

Create two 1/1 colorless Sliver creature tokens.

All Slivers have "{1}, Sacrifice this permanent: Each player discards a card."

This land enters tapped.
When this land enters, sacrifice it unless you pay {1}.
{T}: Add one mana of any color.

All Slivers have "When this permanent enters, destroy target artifact or enchantment."

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

Sliver creatures you control have "{T}, Discard a card: Draw a card."

Sliver creatures you control have "{2}: Untap this creature."

Sliver creatures you control have flying and haste.