I think the Dawn of X/Krakoan Age has a lot of potential. There are new location possibilities, like the blue and green areas. Skill cards could come from various angles, like buffs for "human" characters. There could be a regeneration synergy of The Five, 2 of which we already have available (Hope Summers and Elixir). So maybe Egg produces lane obstructions, Proteus could do a merge with repeat ability, then destroy the card and return to hand (or maybe have a one use rotating activate ability like herbie: replace location, merge and repeat ability, but I would also have a stated 2 turn destroy/return to hand so that strategy is a part of the card. If you could play this card 2-3 times it could be a fun play). Tempus could be an activate card that rewinds the players turn on their side, to counter a move by the other player. Perhaps the season pass card is Xavier X and all the above character cards come with him like infinity stones come with various cards. Or maybe the 3 new ones, so you have to play hope and elixir in your deck for his full ability set. Playing all 6 makes Xavier X bring back cards and restore health or something, a real last round drop. There is also some possibility for Dawn of X variants and baddies, like evil Beast, people from from Orchis (destroy all mutants at a location), maybe Dominion.