Relentless Assault + Helm of the Host + Nature's Will + Eternal Witness

4-card combo · RG

Verdict

Yes — this 4-card loop chains infinite combat phases by recycling Relentless Assault through Eternal Witness tokens while Nature's Will bankrolls each iteration.

Cards required: 4
Cheapest stack total: $21.54
Color identity: RG
Popularity: 17 decks
Format: Commander

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Helm of the Host creates a haste copy of Eternal Witness at every combat step; that copy returns Relentless Assault from the graveyard, and Nature's Will refunds the cost the moment the unblocked creature connects. The whole engine requires a clear attack lane — evasion from your commander or a creature with built-in unblockability is the real prerequisite, so this belongs in aggressive Gruul shells like Galea, Kindler of Hope or a dedicated Helm of the Host voltron build.

Recipe

How it works

Prerequisites

Lands you control can tap to produce at least . You control a creature with power 1 or greater that can attack and that cannot be blocked by an opponent.

Steps

Activate any number of lands by tapping them, adding at least .
Cast Relentless Assault by paying , causing you to untap all creatures that attacked this turn and causing you to get an additional combat and main phase after this one.
At the beginning of your combat phase, Helm of the Host triggers, creating a token copy of Eternal Witness with haste.
When the Eternal Witness token enters, it triggers, returning Relentless Assault from your graveyard to your hand.
Deal combat damage to an opponent. Nature's Will triggers, untapping all lands you control.
Move to your next main phase and repeat from step 1.

Result

Infinite ETB; Infinite storm count; Infinite combat phases; Infinite mana lands you control can produce; Infinite creature tokens with haste; Infinite magecraft triggers; Infinite combat damage; Infinite untap of lands you control

Variations

Cheaper, tighter, alternate lines

Aggravated Assault replaces Relentless Assault and skips the graveyard recovery step entirely, cutting Eternal Witness out of the loop and reducing the piece count to three — run that version if the graveyard is under hate. If Helm of the Host is the target of removal, Combat Celebrant attached to any equipment that grants haste is a rougher substitute, but you lose the Eternal Witness token flood that makes this line especially lethal with a Purphoros, God of the Forge or Impact Tremors already in play.