Marvel Mythic Cards

I have the Season 1 and Marvel Battle Chests, as well as DTA. My son and I like to play Tekken Tag battles with 1 character from each box. We use the mythic cards for S1, but don't have the Marvel ones. When were these available? I see you can preorder them, but there are some Mythic Marvel cards available on eBay. Can anyone that has these cards share what the Mythic abilities are for the Marvel characters so we can utilize those in our Tekken Tag battles?