You can get elemental sparks from Enchantress Mayhem and Surtur/Ymir Mayhem, and flames from A Thousand Apples a Day and Freezer Burn, as well as one of FFF's missions (Flame On I think), and one of the Skrull missions.
Based on others' experiences, you will get Spider-Man Noir.Edit: If you have all the box characters and buy a 49.95 gold pack what will you get?