Activate Scaretiller by tapping it, adding one mana of any color.
Scaretiller triggers, returning Vesuva from your graveyard to the battlefield as a copy of Gods' Eye.
Put Vesuva into your graveyard due to the legend rule.
Vesuva and Retreat to Coralhelm trigger.
Resolve the Retreat to Coralhelm trigger, untapping Scaretiller.
Resolve the Vesuva trigger, creating a 1/1 Spirit creature token.
Repeat.

Infinite colored mana

Infinite creature tokens

Infinite ETB

Infinite landfall triggers

Scaretiller

Vesuva

Gods' Eye, Gate to the Reikai

Retreat to Coralhelm

Paradise Mantle

Activate Urza by tapping Scaretiller, adding {U}.
Scaretiller triggers, returning Vesuva from your graveyard to the battlefield as a copy of Gods' Eye.
Put Vesuva into your graveyard due to the legend rule.
Vesuva and Retreat to Coralhelm trigger.
Resolve the Retreat to Coralhelm trigger, untapping Scaretiller.
Resolve the Vesuva trigger, creating a 1/1 Spirit creature token.
Repeat.

Infinite blue mana

Exile your library

Cast all cards in your library without paying their mana costs

Urza, Lord High Artificer

Activate Urza by tapping Scaretiller, adding {U}.
Scaretiller triggers, returning Vesuva from your graveyard to the battlefield as a copy of Gods' Eye.
Put Vesuva into your graveyard due to the legend rule.
Vesuva triggers, creating a 1/1 Spirit creature token.
When the Spirit enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.

Infinite mana creatures you control can produce

Infinite untap of all creatures

Intruder Alarm

Cryptolith Rite

Activate Scaretiller by tapping it, adding one mana of any color.
Scaretiller triggers, returning Vesuva from your graveyard to the battlefield as a copy of Gods' Eye.
Put Vesuva into your graveyard due to the legend rule.
Vesuva triggers, creating a 1/1 Spirit creature token.
When the Spirit enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.

Activate Earthcraft by tapping Scaretiller, targeting any basic land you control.
Scaretiller triggers, returning Vesuva from your graveyard to the battlefield as a copy of Gods' Eye.
Put Vesuva into your graveyard due to the legend rule.
Vesuva and Retreat to Coralhelm trigger.
Resolve the Retreat to Coralhelm trigger, untapping Scaretiller.
Resolve the Vesuva trigger, creating a 1/1 Spirit creature token.
Resolve the Earthcraft ability from step 1, untapping the basic land.
Activate the basic land by tapping it, adding {1}.
Repeat.

Infinite mana basic lands you control can produce

Infinite untap of basic lands you control

Earthcraft

Activate Earthcraft by tapping Scaretiller, targeting a basic land you control.
Scaretiller triggers, returning Vesuva from your graveyard to the battlefield as a copy of Gods' Eye.
Put Vesuva into your graveyard due to the legend rule.
Vesuva triggers, creating a 1/1 Spirit creature token.
When the Spirit enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Resolve the Earthcraft ability from step 1, untapping the basic land.
Activate the basic land by tapping it, adding {1}.
Repeat.

Combos with "Gods' Eye, Gate to the Reikai"