What is the mana cost of Relentless Assault in Magic: The Gathering?

The mana cost for Relentless Assault is {2}{R}{R}, requiring three generic mana and two red mana. It has a total mana value of 4.

What set does the Relentless Assault card belong to?

Relentless Assault is card number 54 from the Duel Decks: Merfolk vs. Goblins set, which was released in 2017 with the set code DDT.

How does the additional combat phase work on this card?

After casting Relentless Assault, untapped creatures from the previous turn attack again. The game then proceeds to an additional combat phase, followed by an additional main phase, allowing for further spells or attacks.

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Reference artwork · details may differ from this copy

About This Card

The 2017 Magic: The Gathering Relentless Assault card is a Rare Sorcery from the Duel Decks: Merfolk vs. Goblins set, designed for aggressive play.

Relentless Assault

2017 • Magic: The Gathering • Duel Decks: Merfolk vs. Goblins

2017 Magic: The Gathering Duel Decks: Merfolk vs. Goblins

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Market Value

Raw/Ungraded Market: $2.91

Updated 6 days ago

Based on TCGplayer Market (reference)Last Updated Oct 12, 2026Check Price Guide

Market & Price History

Condition	Value	Source	Trend	Price Details
	$2.91Oct 12, 2026	Guide Estimate	-5.2%
Based on TCGplayer Market (reference) Estimate: $2.91, based on Guide Estimate. Source date not availableCaptured Oct 12, 2026 Guide Estimate: $2.91. Evidence date not available. Few comparable observations are available, so this estimate may be less reliable. Over the last 30 days, stored prices ranged from $2.91 to $3.07 across 2 capture days. Change between Sep 22, 2026 and Oct 12, 2026: -5.2%. Compares the same source, grade and signed status. Capture days are not completed-sale counts.

$2.91Oct 12, 2026
Source
Guide Estimate
Trend
-5.2%
Price Details
Based on TCGplayer Market (reference)
Estimate: $2.91, based on Guide Estimate.
Source date not availableCaptured Oct 12, 2026
Guide Estimate: $2.91. Evidence date not available.
Few comparable observations are available, so this estimate may be less reliable.
Over the last 30 days, stored prices ranged from $2.91 to $3.07 across 2 capture days. Change between Sep 22, 2026 and Oct 12, 2026: -5.2%. Compares the same source, grade and signed status. Capture days are not completed-sale counts.

30-day Price History

Raw / Ungraded

TCGplayer Market (reference) · Guide Estimate evidence · captured Oct 12, 2026

Each point is the last stored observation that day for this printing, condition, grader, autograph status and source. Gaps mean no observation; guide estimates and asking prices are not completed sales.

Product Overview

Description

The 2017 release of Relentless Assault from the Duel Decks: Merfolk vs. Goblins set stands as a pivotal piece for Magic: The Gathering collectors and players alike. The card's design and mechanics reflect the aggressive, tempo-focused philosophy that defined the Duel Decks series, offering a streamlined experience for both new and veteran enthusiasts. As a foundational piece in the Magic: The Gathering trading card game, this card invites collectors to engage with one of the most dynamic formats in tabletop gaming. Gameplay-wise, Relentless Assault requires a mana cost of {2}{R}{R}, placing it firmly in the red color identity with a mana value of 4. When cast, it untaps all creatures that attacked during the current turn. Crucially, it triggers an additional combat phase followed by an additional main phase. This unique sequence allows players to unleash a second round of attacks, often overwhelming opponents who have already committed to defending. The strategic depth of this effect makes it a favorite for decks aiming to maximize creature damage in a single turn. Collectors of Magic: The Gathering memorabilia and cards often seek out this card for its iconic status within the Merfolk vs. Goblins rivalry, representing a key moment in the Duel Decks era. Its enduring popularity ensures that it remains a relevant and desirable addition to any comprehensive collection of the DDT set.

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