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 1/1 sliver tokens

Infinite ETB

Sliver Queen

Reflex 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 all Slivers in your library

Infinite mana creatures you control can produce

Near-infinite ETB

Infinite untap of all creatures

Sliver Overlord

Intruder Alarm

Heartstone

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

Activate Meldweb Strider by tapping it, dealing 2 damage to any target and three damage to itself.
Meldweb Strider dies as a state-based action due to having zero or less toughness.
Shelob triggers, creating a token copy of Meldweb Strider that is a Food artifact.
Activate the Meldweb Strider token by removing an oil counter from it, causing it to become an artifact creature until end of turn.
Repeat.

Infinite damage

Infinite death triggers

Infinite LTB

Infinite sacrifice triggers

Shelob, Child of Ungoliant

Meldweb Strider

Maskwood Nexus

Psionic Sliver

Activate Cauldron Familiar by tapping it, dealing 2 damage to any target and three damage to itself.
Cauldron Familiar dies as a state-based action due to having zero or less toughness.
Shelob triggers, creating a token copy of Cauldron Familiar that is a Food artifact.
Activate the nontoken Cauldron Familiar by sacrificing the Cauldron Familiar token, returning the nontoken Cauldron Familiar from your graveyard to the battlefield.
When Cauldron Familiar enters the battlefield, it triggers, causing each opponent to lose 1 life and you to gain one life.
Repeat.

Infinite lifegain

Infinite lifegain triggers

Infinite lifeloss

Cauldron Familiar

Combos with "Reflex Sliver"