Agrus Kos, Eternal Soldier + Soulbright Flamekin + Deflecting Swat + Felidar Guardian + Ardent Elementalist

5-card combo · RW

Verdict

Yes — this 5-card Boros loop generates infinite ETBs, infinite red mana, and infinite storm count through a precise Agrus Kos copy chain.

Cards required: 5
Cheapest stack total: $2.29
Color identity: RW
Popularity: 0 decks
Format: Commander

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Agrus Kos, Eternal Soldier is the engine: every activated ability or triggered ability on a creature gets copied across the board for 1 and a hybrid mana, turning Soulbright Flamekin's pump activation into eight free red mana and Felidar Guardian's blink trigger into mass recursion. Deflecting Swat redirects the leftover Felidar Guardian trigger back to Agrus Kos each loop to keep the cycle alive, while Ardent Elementalist returns the Swat from the graveyard on each Felidar blink so it's available to cast for free again immediately.

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 Ardent Elementalist, blinking Soulbright Flamekin and Ardent Elementalist.
When Ardent Elementalist 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 tightly assembled — all five pieces are load-bearing and no obvious single swap exists at the same mana efficiency. The infinite red mana closes with Walking Ballista or Crackle with Power; without a mana sink already in hand, the loop generates storm count but no direct kill. Toralf, God of Fury or Aetherflux Reservoir are the cleanest closers given the color identity.