Displacer Kitten + Molten-Core Maestro + Storm-Kiln Artist + Infirmary Healer // Stream of Life

Decks

How it works

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Cast the copy of Stream of Life from exile for X=4 by paying .
When you cast that spell, Molten-Core Maestro, Storm-Kiln Artist, and Displacer Kitten trigger.
Resolve the Displacer Kitten trigger, blinking Infirmary Healer, which enters prepared.
Resolve the Molten-Core Maestro trigger, putting a +1/+1 counter on it and adding an amount of 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.
Cast a copy of the prepared spell from exile by paying one mana, unpreparing Infirmary Healer // Stream of Life.
When you cast this, Displacer Kitten and Storm-Kiln Artist triggers.
Resolve the Displacer Kitten ability, flickering Infirmary Healer // Stream of Life, which enters prepared.
Resolve the remaining trigger, creating a Treasure token.
Resolve the spell from step 1.
Activate the Treasure token by tapping and sacrificing it, adding one mana.
Repeat.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.