This seems as realistic a plan as the plots of the Pirates of the Caribbean movies, but pass the rum and lets do this thing
No symbols or rules text of the permanent it melds into are considered.
Jorn, God of Winters attack trigger also untaps itself, leaving you with a board of snow creatures that are ready to defend and a fresh board of mana for your second main phase (or your opponents turns)
The group brave the mountain's perils and defeat the mighty Scarmiglione at the summit
While I can imagine situations where the ability is amazing and allows you to kill two opponents out of nowhere and win the game, this still requires getting in combat damage, not just with a single creature, but with your entire team
In Adventures in the Forgotten Realms, the two things have been fused