All slivers have haste.
Tap a Sliver to generate {1}.
Use that mana to create a Sliver with Sliver Queen's ability.
Use the newly created Sliver to repeat the cycle.

Infinite creature tokens

Infinite creature ETB

Sliver Queen

Blur Sliver

Gemhide Sliver

Training Grounds

Manaweft Sliver

Activate all Slivers you control by tapping them, adding at least {4}.
Activate Sliver Overlord's first ability by paying {3}, searching your library for a Sliver with mana value 1.
Cast that Sliver by paying {1}.
Intruder Alarm triggers, untapping all creatures.
Repeat, gaining {1} more each time in step 1 and searching for a Sliver costing up to {1} more each time in step 2.

Cast a subset of spells in your library

Infinite mana creatures you control can produce

Infinite untap of creatures

Near-infinite creature ETB

Sliver Overlord

Intruder Alarm

Heartstone

Biomancer's Familiar

Activate Silver Queen by paying {1}, creating a 1/1 Sliver creature token.
Activate the Sliver token by tapping it, adding {1}.
Repeat.

Infinite tapped creature tokens

Agatha of the Vile Cauldron

Combos with "Blur Sliver"