Thermokarst

Land destruction priced into green's clean color-pie lane, with a flavor rider that only pays off in the set that invented snow as a supertype. The base effect is straightforward green land removal at the same mana value as Stone Rain, but the snow clause is the design artifact worth dwelling on: it rewards you for blowing up the very lands the set asked you to build around, a small incentive loop that ties the spell to the frozen-permanent theme rather than letting it float as generic disruption. The life gain is incidental in raw value, never enough to matter on its own, but it does the work of making the card feel like a green answer to a specific environmental hazard rather than a flat removal spell. Sorcery speed and single-target scope keep it honest: this is proactive mana denial, not reactive interaction, and it can only ever set one land back at a time. The snow rider is the kind of mechanically-tethered flavor that early design leaned on heavily, encoding the set's central conceit directly into a card's reward structure, then quietly dropping it once the supertype moved on.