Agrus Kos, Eternal Soldier + Soulbright Flamekin + Deflecting Swat + Felidar Guardian + Zealous Lorecaster

5-card combo · RW

Verdict

Yes — this 5-card Boros loop generates infinite red mana, infinite ETBs, and infinite storm count once it assembles.

Cards required: 5
Cheapest stack total: $108.26
Color identity: RW
Popularity: 0 decks
Format: Commander

Buy required cards on TCGplayer

Agrus Kos, Eternal Soldier is the engine: every activated ability or triggered ability gets copied across each other creature you control for 1 plus a red or white mana, which means Soulbright Flamekin's 2-mana pump ability refunds eight red per loop iteration. Zealous Lorecaster recovers Deflecting Swat from the graveyard each time it blinks, and Deflecting Swat — cast for free — redirects the leftover Felidar Guardian trigger back to Agrus Kos to restart the chain. The table sees a Guardian ETB that never resolves cleanly and a mana pile that keeps growing.

Recipe

How it works

Prerequisites

You control your commander. You have not activated Soulbright Flamekin's ability more than twice this turn.

Steps

Activate Soulbright Flamekin by paying , targeting Agrus Kos.
Agrus Kos triggers, causing you to pay to copy Soulbright Flamekin's ability targeting each other creature you control.
Resolve all Soulbright Flamekin triggers, giving the targeted creatures trample until end of turn and adding eight .
Cast Felidar Guardian by paying .
When Felidar Guardian enters the battlefield, it triggers, targeting Agrus Kos.
Agrus Kos triggers, causing you to pay to copy Felidar Guardian's trigger, targeting each other creature you control except Felidar Guardian.
Resolve the copies of Felidar Guardian's trigger targeting Soulbright Flamekin and Zealous Lorecaster, blinking Soulbright Flamekin and Zealous Lorecaster.
When Zealous Lorecaster enters the battlefield, it triggers, returning Deflecting Swat from your graveyard to your hand.
Holding priority, activate Soulbright Flamekin by paying , targeting Agrus Kos.
Agrus Kos triggers, causing you to pay to copy Soulbright Flamekin's ability targeting each other creature you control.
Resolve all Soulbright Flamekin triggers, giving the targeted creatures trample until end of turn and adding eight .
Cast Deflecting Swat by paying , changing any of the remaining Felidar Guardian triggers not targeting Agrus Kos to target Agrus Kos instead.
Repeat from step 6.

Result

Infinite ETB; Infinite LTB; Infinite blinking; Infinite magecraft triggers; Infinite red mana; Infinite storm count

Variations

Cheaper, tighter, alternate lines

The five-piece requirement is the honest weakness here — losing any single piece collapses the loop entirely. Soulbright Flamekin's activation limit of three per turn is already spent by the setup, so the mana generation relies entirely on Agrus Kos copying it; if Agrus Kos is removed in response to the first activation, the loop never starts. Grapeshot or Aetherflux Reservoir converts the infinite storm count into the kill — without one in hand or on board, the infinite mana sits idle.