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Ashcoat of the Shadow Swarm

Legendary Creature — Rat Warlock

Whenever Ashcoat attacks or blocks, other Rats you control get +X/+X until end of turn, where X is the number of Rats you control.
At the beginning of your end step, you may mill four cards. If you do, return up to two Rat creature cards from your graveyard to your hand. (To mill a card, put the top card of your library into your graveyard.)

CMC
4
Mana cost
{3}{B}
Color identity
B
Rarity
mythic
Set
Jumpstart 2022
Price
$58.74
EDHREC rank
#5125
Buy on TCGplayer
Ashcoat of the Shadow Swarm card art
Ashcoat of the Shadow Swarm pumps your entire Rat board +1/+1 for each Rat that died this turn — an on-board anthem that scales with the sacrificial engines Rat decks already run. The Mind Over Matter combo package makes it one of the few Rat legends that doubles as both a payoff and a setup piece, and at two black mana it costs almost nothing to deploy.

Best Commanders

Commanders with the highest synergy

01
Rat King, Verminister

Rat King, Verminister

61.2% of decks · synergy 0.58

Rat King, Verminister appears in 61% of decks running Ashcoat of the Shadow Swarm because Ashcoat's end-of-turn buff directly rewards the mass-sacrifice loops Rat King enables — every Rat that dies to fuel Rat King's triggers becomes a +1/+1 counter on every survivor.

02
Marrow-Gnawer

Marrow-Gnawer

50.9% of decks · synergy 0.47

Marrow-Gnawer's sac-for-tokens engine feeds Ashcoat of the Shadow Swarm directly: sacrifice a Rat, make more Rats, and the survivors grow at end of turn, turning Marrow-Gnawer's disposable tokens into a genuine power escalation.

03
Karumonix, the Rat King

Karumonix, the Rat King

39.0% of decks · synergy 0.36

Karumonix, the Rat King shows up in 39% of Ashcoat of the Shadow Swarm lists because the poison-counter gameplan still wants a wide Rat board, and Ashcoat's end-step buff lets that board threaten both infect damage and combat math simultaneously.

04
Wick, the Whorled Mind

Wick, the Whorled Mind

36.0% of decks · synergy 0.35

Wick, the Whorled Mind's copy-token output means a single Rat sacrifice ripples into multiple bodies, and Ashcoat of the Shadow Swarm turns that token flood into a late-game clock that grows each time Wick's engine cycles.

05
Vren, the Relentless

Vren, the Relentless

31.8% of decks · synergy 0.31

Vren, the Relentless rewards casting Rats from exile and generating tokens on entry, and Ashcoat of the Shadow Swarm converts the disposable bodies Vren burns through into permanent stat gains on whatever's left standing.

Format Analysis

Where it lives, where it can’t

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

Commander is where Ashcoat of the Shadow Swarm actually lives — Rat tribal has a dedicated Commander audience, the game goes long enough for the end-step buff to compound meaningfully, and the 99-card format means you can surround it with every sacrifice engine it wants. Legacy and Vintage are both legal but practically irrelevant; no competitive shell in either format is trying to pump a Rat swarm. Oathbreaker is a functional home if you're running a Rat-focused build there, but the format is niche enough that the card sees essentially no play outside Commander.

Key Combos

Combo lines featuring this card

Budget Alternatives

Cheaper options that do most of the same work

If $58.74 is too steep, Rat Colony and Relentless Rats both give you redundant bodies that scale the swarm cheaply, though neither replaces the anthem effect Ashcoat of the Shadow Swarm provides — you're trading a payoff engine for raw headcount. Piper of the Swarm is the closest budget piece that interacts with the Rat gameplan at a functional level, offering board control and token generation for under a dollar, but again it doesn't replicate the end-step pump that makes Ashcoat worth the slot.

Price Context

Current price

$58.74 premium tier

At $58.74, Ashcoat of the Shadow Swarm sits firmly in premium territory — justified only if you're running a dedicated Rat tribal Commander deck where its anthem effect is central to the win condition. It's a chase card for a niche archetype, so price stability depends almost entirely on whether Rat tribal retains its Commander audience.

Explore

Sources

Mentioned

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