I've swapped Skrull with Dr. Doom and put him next to Black Knight, and then the enemy Skrull/OML drop him into yellow and then Apoc goes zoom. Sometimes Doom bleeds out... but he has a revive so it doesn't matter.
Hopefully they will release new toons from alpha flight so all can unlock but probably a 0.0000000-10001 chance for that . We'll get hulk fragments lol surprise