Here’s some Thanos ideas I was toying around with a while back:
Thanos would be a 4* or 5* character. Thanos can only wield 3 of 6 possible powers, each relating to an infinity stone, at any time. This would mean players could have different Thanos colours and Thanos could be speced with any 3 colours. Match damage is equal for all colours until he is covered and then damage for the covered colour increases at the expense of a non-covered colour. Might need a new mechanic so that covers won matched existing covers once up to 3 colours?
Soul Gem (Green AP) - Allows the user to steal, control, manipulate and alter souls.
Thanos manipulates the targets soul, stealing up to X AP of their strongest colour and stunning them for Z turns
Upgrades - steals more AP, stuns for longer, steals all AP of the colour, does damage
Psylockes blue with stun
Space Gem (Purple AP) - Allows the user to exist in any or all locations, move any object anywhere throughout reality and warp or rearrange space.
Thanos alters the very fabric of space and avoids match damage for X turns
Upgrades - team also avoid match damage, Thanos also dodges powers (no effect), team also dodges powers
Pumped up version of Hawkeye’s Avoid
Mind Gem (Blue AP) - Allows the user to greatly strengthen and enhance mental and psionic power and access the thoughts and dreams of other beings.
Places X random colour tiles on board that increase Thanos’ match damage.
Upgrades - place more tiles, increase team member damage too, decrease enemy match damage.
Reality Gem (Yellow AP) - Allows the user to fulfil wishes, even if the wish is in direct contradiction with scientific laws.
Change X random basic tiles to a random colour.
Upgrades - more tiles, effects strike/ attack / countdown tiles, does damage, player choses colour to convert to when casting
A customisable Thunder Strike
Power Gem (Red AP) - Accesses all power and energy that ever has or will exist, and can boost the other gems’ effects. Allows the user to duplicate almost any physical superhuman ability and grants Omnipotence.
Thanos casts a team mates ability at no AP cost. Can’t fire downed team mate abilites.
Upgrades - can fire downed team mate abilities, fired at increased effect, fire enemy team abilities, enemy cannot use fired power for X turns.
A modified team-up mechanic
The 6th stone (Time) is orange which doesn’t match a game colour. Guess you could make a black power in its place.
Time Gem (Black AP) Allows the user total control over the past, present and future. Allows time travel, can age and de-age beings and also be used as a weapon by trapping enemies in unending loops of time.
Sounds like a heal/stun power with possible damage.