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Captain Storm, Cosmium Raider

Legendary Creature — Human Pirate

Whenever an artifact you control enters, put a +1/+1 counter on target Pirate you control.

CMC
2
Mana cost
{U}{R}
Color identity
RU
Rarity
uncommon
Set
The Lost Caverns of Ixalan
Price
$0.17
EDHREC rank
#5554
Buy on TCGplayer
Captain Storm, Cosmium Raider card art
Captain Storm, Cosmium Raider generates a Treasure every time you cast a spell from exile, which pairs explosively with any commander that pushes you toward that play pattern — Animation Module turns the resulting artifacts into a recursive engine on top of that. The ask is three mana for a 3/3, which is fair enough that the upside is pure profit.

Best Commanders

Commanders with the highest synergy

01
Edward Kenway

Edward Kenway

74.3% of decks · synergy 0.70

Edward Kenway exiles cards and lets you cast them, so Captain Storm, Cosmium Raider converts every one of those casts into a Treasure — the two cards are essentially co-pilots of the same engine.

02
Breeches, Brazen PlundererMalcolm, Keen-Eyed Navigator

Breeches, Brazen Plunderer // Malcolm, Keen-Eyed Navigator

60.8% of decks · synergy 0.59

Malcolm, Keen-Eyed Navigator rewards connecting with opponents, and Breeches, Brazen Plunderer lets you cast what you hit — Captain Storm, Cosmium Raider then taxes every exile-cast spell into a Treasure, compounding the mana advantage from a single combat step.

03
Admiral Beckett Brass

Admiral Beckett Brass

38.4% of decks · synergy 0.34

Admiral Beckett Brass steals permanents, and the supporting pirate package naturally fills up with exile-based card advantage where Captain Storm, Cosmium Raider converts each off-the-top cast into mana acceleration.

04
Admiral Brass, Unsinkable

Admiral Brass, Unsinkable

34.1% of decks · synergy 0.30

Admiral Brass, Unsinkable exiles pirates from the graveyard and reanimates them, triggering Captain Storm, Cosmium Raider whenever you cast from that exile zone and keeping the Treasure engine running through board wipes.

05
Kediss, Emberclaw FamiliarMalcolm, Keen-Eyed Navigator

Kediss, Emberclaw Familiar // Malcolm, Keen-Eyed Navigator

30.6% of decks · synergy 0.29

Malcolm, Keen-Eyed Navigator's Treasure production already rewards going wide in combat, and Captain Storm, Cosmium Raider stacks additional Treasures onto every spell cast from exile — Kediss, Emberclaw Familiar then multiplies the damage that mana advantage enables.

Format Analysis

Where it lives, where it can’t

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

Commander is where Captain Storm, Cosmium Raider lives — pirate tribal has enough critical mass there to make the exile-cast trigger fire consistently, and three mana for a 3/3 with upside is entirely acceptable at a 100-card singleton table. In competitive 60-card formats like Modern and Pioneer, a three-mana 3/3 that does nothing the turn it enters isn't close to the rate those formats demand, and the exile-cast payoff requires too much infrastructure to assemble quickly. Legacy and Vintage have the raw power density to execute that infrastructure, but neither format has any reason to build around Captain Storm, Cosmium Raider when the available tools are so much stronger. Standard is technically legal, but the card sees no meaningful play there.

Key Combos

Combo lines featuring this card

Price Context

Current price

$0.17 bulk tier

At $0.17, Captain Storm, Cosmium Raider is bulk — pick it up without hesitation if it fits your pirate build. It sees enough Commander play in Edward Kenway and Admiral Brass, Unsinkable lists to be a safe, low-risk include, but the price reflects its irrelevance outside Commander.

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Sources

Mentioned

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