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Cloud Key

Artifact

As this artifact enters, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost {1} less to cast.

CMC
3
Mana cost
{3}
Color identity
C
Rarity
rare
Set
The Brothers' War Retro Artifacts
Price
—
EDHREC rank
#643
Buy on TCGplayer
Cloud Key card art
Cloud Key shaves a mana off an entire card type for the rest of the game — artifacts, instants, sorceries, creatures, enchantments — and at three mana it pays for itself within two or three spells. The classic pairing with Sensei's Divining Top turns a cost-reduction into a draw engine, and in Mm'menon, the Right Hand decks it's a near-auto-include for that reason alone.

Best Commanders

Commanders with the highest synergy

01
Mm'menon, the Right Hand

Mm'menon, the Right Hand

64.6% of decks · synergy 0.58

Mm'menon, the Right Hand runs Cloud Key in nearly two-thirds of its builds because the cost reduction stacks directly with Mm'menon's artifact-casting triggers, letting you chain spells faster and hit your combo threshold a full turn earlier.

05
Chiss-Goria, Forge Tyrant

Chiss-Goria, Forge Tyrant

50.0% of decks · synergy 0.47

Chiss-Goria, Forge Tyrant rewards going wide on artifacts, and Cloud Key reducing the cost of the artifact type turns what would be a midrange curve into a tempo engine that floods the board a turn ahead of schedule.

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 Cloud Key does its best work — the singleton format rewards permanent cost-reduction that scales across an entire game, and the artifact and spell-heavy commanders it slots into are everywhere in the format. In Legacy and Vintage it's legal but rarely sees competitive play; those formats have faster and more broken cost-reduction available, so Cloud Key is strictly a casual or fringe option there. Modern is the same story: legal on paper, but the format's speed outpaces what a three-mana do-nothing artifact can provide. Pioneer, Standard, and Pauper don't apply. Oathbreaker is a reasonable home for the same reasons as Commander — tight spell-type themes and a lower average game length that still lets a turn-three Cloud Key matter.

Key Combos

Combo lines featuring this card

Price Context

Current price

unknown tier

Pricing data isn't currently available for Cloud Key, so check Scryfall or TCGPlayer for a live number before buying. Given its consistent inclusion in artifact and spell-cost commanders, it tends to hold value above bulk — expect to pay accordingly if demand in those archetypes stays high.

Explore

Sources

Mentioned

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