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Thermal Flux

Instant

Choose one —
• Target nonsnow permanent becomes snow until end of turn.
• Target snow permanent isn't snow until end of turn.
Draw a card at the beginning of the next turn's upkeep.

CMC
1
Mana cost
{U}
Color identity
U
Rarity
common
Set
Coldsnap
Price
$0.30
EDHREC rank
#11138
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Thermal Flux card art
Thermal Flux lets you change a permanent's type to snow or remove that designation — a zero-mana cantrip in the right shell that does real work for a single blue mana. Orvar, the All-Form turns every copy of it into a free clone spell, and Jorn, God of Winter // Kaldring, the Rimestaff runs it to toggle snow status on key permanents and keep the engine spinning.

Best Commanders

Commanders with the highest synergy

01
Orvar, the All-Form

Orvar, the All-Form

73.5% of decks · synergy 0.71

Thermal Flux is a one-mana cantrip that targets a permanent you control, which is all Orvar, the All-Form needs — cast it, copy your best permanent, draw a card, and do it again with the copy trigger.

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 legal
oathbreaker legal

Thermal Flux is legal in Commander, Legacy, Modern, Vintage, Pauper, and Oathbreaker, but it sees almost no play outside Commander. In Pauper it's a common with a narrow use case and no real home. Legacy and Vintage have zero interest — snow synergy isn't a competitive axis in those formats. Commander is where Thermal Flux earns its slot, specifically in snow-matters or Orvar decks where the cantrip rider and targeting clause do actual work.

Key Combos

Combo lines featuring this card

Price Context

Current price

$0.30 bulk tier

At $0.30, Thermal Flux is firmly bulk — easy to pick up without thinking about it. It won't climb unless a breakout snow commander pulls it into the spotlight, so grab it cheap and move on.

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Sources

Mentioned

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