Activate Sliver Overlord by paying {3}, searching your library for any Sliver creature card and putting it into your hand.
Cast the Sliver by paying {0} due to Morophon and Jodah.
When the Sliver enters the battlefield, Mana Echoes triggers, adding at least {C}{C}{C}.
Repeat.

Cast all Slivers in your hand and library without paying their mana costs

Near-infinite colorless mana

Morophon, the Boundless

Sliver Overlord

Jodah, Archmage Eternal

Mana Echoes

Cast Venser by paying {0}.
When Venser enters, it triggers, returning itself from the battlefield to your hand.
Repeat.

Infinite LTB

Infinite ETB

Infinite storm count

Venser, Shaper Savant

Activate up to seven lands you control by tapping them, adding at least {2}{W}{U}{B}{R}{G}{G}.
Cast Great Whale by paying {W}{U}{B}{R}{G}.
Great Whale enters the battlefield, untapping the seven lands.
Activate Temur Sabertooth by paying {1}{G}, returning Great Whale from the battlefield to your hand.
Repeat.

Infinite mana lands you control can produce

Infinite untap of lands you control

Temur Sabertooth

Great Whale

Cast Ebondeath from your graveyard by paying {0}.
Activate Carrion Feeder by sacrificing Ebondeath, putting a +1/+1 counter on Carrion Feeder.
Repeat.

Infinite +1/+1 counters on Carrion Feeder

Infinite death triggers

Infinite sacrifice triggers

Ebondeath, Dracolich

Carrion Feeder

Activate Composite Golem by sacrificing it, adding {W}{U}{B}{R}{G}.
When Composite Golem dies, Enduring Renewal triggers, returning Composite Golem from your graveyard to your hand.
Cast Composite Golem by paying {W}{U}{B}{R}{G} due to Jodah.
Repeat.

Composite Golem

Enduring Renewal

Combos with "Jodah, Archmage Eternal"