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Relentless Assault

Sorcery

Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase.

CMC
4
Mana cost
{2}{R}{R}
Color identity
R
Rarity
rare
Set
Portal Second Age
Price
$5.05
EDHREC rank
#1539
Buy on TCGplayer
Relentless Assault card art
Relentless Assault gives your entire board a second attack step for four mana — no setup required, just open the combat phase again. Commanders like Etali, Primal Storm that trigger on attack turn this into a second free-spells engine, and Helm of the Host makes the effect recursive across multiple turns.

Best Commanders

Commanders with the highest synergy

01
Etali, Primal Storm

Etali, Primal Storm

50.0% of decks · synergy 0.44

Etali, Primal Storm attacks and exiles cards from every opponent's library — Relentless Assault doubles that trigger, which means two rounds of free spells from a single turn.

02
Narset, Enlightened Master

Narset, Enlightened Master

40.5% of decks · synergy 0.38

Narset, Enlightened Master exiles the top four cards and gets to cast noncreature spells among them for free on each attack; Relentless Assault effectively doubles her exile count per turn, burying opponents in card advantage.

03
Wyleth, Soul of Steel

Wyleth, Soul of Steel

39.1% of decks · synergy 0.34

Wyleth, Soul of Steel draws a card for each Aura and Equipment attached to it whenever it attacks; Relentless Assault lets Wyleth attack twice, translating directly into twice the cards drawn in a single turn.

04
Otharri, Suns' Glory

Otharri, Suns' Glory

34.8% of decks · synergy 0.30

Otharri, Suns' Glory creates Rebel tokens with haste whenever it attacks, so Relentless Assault produces a second wave of tokens and a second opportunity to swing for lethal with them.

05
Gornog, the Red Reaper

Gornog, the Red Reaper

34.8% of decks · synergy 0.29

Gornog, the Red Reaper gets stronger as creatures die in combat, and Relentless Assault opens a second combat to pile on additional deaths and grow Gornog's payoffs within the same turn.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern legal
pioneer not legal
standard not legal
vintage legal
pauper not legal
oathbreaker legal

Commander is where Relentless Assault actually lives — the attack-trigger density in the format turns a redundant combat step into a multiplicative engine rather than a marginal tempo gain. In Legacy and Vintage it's technically legal but sees essentially no play; the formats are too fast and interactive for a four-mana sorcery that does nothing without creatures already in play. Modern has the same problem: you're more likely to be dead or out of creatures by the time this resolves than to untap and swing again profitably. Oathbreaker is the only other format worth mentioning, and there it follows the same logic as Commander — if your planeswalker's plus ability triggers on attacks, Relentless Assault can double the loyalty gain.

Key Combos

Combo lines featuring this card

17 decks
Relentless AssaultHelm of the HostNature's WillEternal Witness

Relentless AssaultHelm of the HostNature's WillEternal Witness

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

View combo details →

Budget Alternatives

Cheaper options that do most of the same work

Savage Beating and Moraug, Fury of Akoum both overlap heavily with Relentless Assault — Savage Beating costs the same mana and can be entwined for a double-strike rider, while Moraug generates additional combat steps from landfall rather than a spell. If the goal is pure redundancy in an attack-trigger deck, Aggravated Assault is the premium version that can go infinite, but it costs significantly more; for a strict budget replacement in the same slot, Scourge of the Throne gives you an extra combat when you attack the player with the most life, though it requires hitting combat rather than just casting a spell.

Price Context

Current price

$5.05 mid tier

At $5.05, Relentless Assault sits in the mid tier — affordable enough that there's no reason to skip it in any deck that wants the effect, but not so cheap that you'll find it in every bulk bin. The price is stable; it's not a chase rare, and its consistent demand from attack-trigger commanders keeps it from falling further.

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Sources

Mentioned

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Updated . Data from Scryfall, EDHREC, and Commander Spellbook.