Cast the copy of the spell from exile by paying its mana cost.
When you cast that spell, Molten-Core Maestro, Storm-Kiln Artist, and Displacer Kitten trigger.
Resolve the Displacer Kitten trigger, blinking Vastlands Scavenger, which enters prepared.
Resolve the Molten-Core Maestro trigger, putting a +1/+1 counter on it and adding an amount of {R} equal to its power.
Resolve the Storm-Kiln Artist trigger, creating a Treasure token.
Activate the Treasure token by tapping and sacrificing it, adding the one non-red mana you need to cast the spell from step 1.
Resolve the spell from step 1.
Repeat.

Infinite artifact ETB

Infinite artifact LTB

Infinite +1/+1 counters on a creature

Infinite creature ETB

Infinite creature LTB

Infinite magecraft triggers

Infinite red mana

Infinite storm count

Infinite self-mill

Put a selection of creature cards from your library onto the battlefield

Displacer Kitten

Molten-Core Maestro

Storm-Kiln Artist

Vastlands Scavenger // Bind to Life

Cast Bind to Life using Caetus, Sea Tyrant of Segovia's convoke ability by tapping creatures you control.
Displacer Kitten triggers, blinking Vastlands Scavenger.
When Vastlands Scavenger enters, Intruder Alarm triggers, untapping all creatures you control.
Repeat.

Infinite casts of a specific spell

Intruder Alarm

Invasion of Segovia // Caetus, Sea Tyrant of Segovia

Cast the copy of Bind to Life from exile by paying five mana and unpreparing Vastlands Scavenger.
When you cast that spell, Displacer Kitten triggers, blinking Vastlands Scavenger, which enters prepared.
Resolve the copy of Bind to Life, milling seven cards and optionally putting a creature card from among them onto the battlefield.
Activate Titans' Nest five times by exiling five cards from your graveyard, adding {C}{C}{C}{C}{C} that can be cast as though it were any color but only on colored spells without X in their cost.
Repeat.

Titans' Nest

Chromatic Orrery

Cast a copy of the prepared spell by paying its mana cost.
When you cast that spell, Displacer Kitten and Dovescape trigger.
Resolve the Dovescape trigger, countering the prepared spell and creating a number of 1/1 flying Bird creature tokens equal to its mana value.
Resolve the Displacer Kitten trigger, blinking Vastlands Scavenger // Bind to Life, which enters prepared.
Activate Phyrexian Altar by sacrificing a Bird token, adding one mana of any color.
Repeat step 5 until you have enough mana to cast the prepared spell.
Repeat.

Combos with "Vastlands Scavenger // Bind to Life"