Agrus Kos, Eternal Soldier + Soulbright Flamekin + Deflecting Swat + Felidar Guardian + Returned Pastcaller

5-card combo · RW

Verdict

Yes — this 5-card Boros engine generates infinite ETBs, infinite red mana, and infinite storm count once all pieces are on the battlefield.

Cards required: 5
Cheapest stack total: $97.89
Color identity: RW
Popularity: 0 decks
Format: Commander

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Agrus Kos, Eternal Soldier is the glue: every activated ability or triggered ability paid through him multiplies across the board, turning Soulbright Flamekin's 2-mana pump into eight red mana per cycle. Felidar Guardian blinks Soulbright Flamekin and Returned Pastcaller back into play; Returned Pastcaller recovers Deflecting Swat from the graveyard each loop, and Deflecting Swat redirects leftover Felidar Guardian triggers back to Agrus Kos to keep the chain alive. The table sees a Boros blink shell that looks fair until Agrus Kos hits play and suddenly every creature trigger doubles.

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 Returned Pastcaller, blinking Soulbright Flamekin and Returned Pastcaller.
When Returned Pastcaller 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 LTB; Infinite ETB; Infinite storm count; Infinite red mana; Infinite magecraft triggers; Infinite blinking

Variations

Cheaper, tighter, alternate lines

The combo is tight on substitutions — Agrus Kos, Eternal Soldier is the commander, so the copy-ability layer is non-negotiable, and Returned Pastcaller's specific ETB retrieving Deflecting Swat has no clean drop-in. The infinite red mana closes games with Crackle with Power or Jaya's Immolating Inferno targeting each opponent; without a red mana sink in hand, the loop produces storm count and ETBs that need an Aetherflux Reservoir or similar payoff already on the battlefield.