Omnipotent Ant-Man

This deck allows Ant man to do it all. With Heroic Intuition he can thwart for 3 plus an extra 1 by switching to Ant-Man. Keep the Allies, especially Wasp, out as much as possible to let yourself Earth's Mightiest Heroes off of them and use Swarm Tactics to change and ready for even more thwart power. Honorary Avenger on yourself incase you have to ready with Earths Mightiest Heroes before switching from alter ego, plus the extra health doesn't hurt. All the while building Tenacities, Enhanced Physique, Giant Strength and Adrenaline Rush. Enhanced Physique will not only pay for Tenacity, but it'll make those 4 card hands from Giant-Man hurt a little less. The longer you build the more pay off you can get, but at a certain point it's overkill so use as needed.

Max damage would be something like this: Change into Giant for 1. Attack for 8 because of Giant Strength and Adrenaline Rush. Use Resize to change form and ants for 3 more. Swarm Tactics to go giant again for 1, +2 strength and ready. Attack 7 more times for 70 damage thanks to Earth's Mightiest Heroes and Tenacity. Total of 83 damage. With the perfect hand you could even Giant Stomp twice for a total of 99 damage.

You might even get more if you deck out mid turn, but this is just assuming you're using each card once.