First printed in Coldsnap (2006)
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.
- Illustrated by
- Jeff Miracola
Legality
- Legal in
- Modern, Legacy, Vintage, Pauper, Commander, Duel Commander, Pauper Commander, PreDH, Tiny Leaders, Oathbreaker
- Not legal in
- Standard, Pioneer, Future Standard, Historic, Timeless, Alchemy, Penny Dreadful, Premodern, Old School 93/94, Gladiator, Brawl, Standard Brawl, Competitive Brawl
Ruling (1)
- Thermal Flux adds or removes the supertype snow from a permanent. Adding or removing a supertype doesn’t affect any other types, supertypes, or subtypes that permanent has.
Prices
MTGO price: 0.002 TIX, the cheapest non-foil print (average sell price on GoatBots, 1 Nov 2026).
Combos
4 combos, the most popular first:
- Infinite mana snow permanents you control can produce, Infinite untap of snow permanents you control: Jorn, God of Winter // Kaldring, the Rimestaff + Strionic Resonator + Thermal Flux
- Infinite mana snow permanents you control can produce, Infinite untap of snow permanents you control: Jorn, God of Winter // Kaldring, the Rimestaff + Lithoform Engine + Thermal Flux
- Infinite creature tokens with haste, Infinite death triggers…: Kiki-Jiki, Mirror Breaker + Rime Tender + Thermal Flux + To Arms!
- Infinite death triggers, Infinite creature ETB…: Kiki-Jiki, Mirror Breaker + Rime Tender + Thermal Flux