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King of Tokyo: Powerup has an evolution card for Meka Dragon called Mecha Blast that reads:
Discard this Evolution to deal 2 extra damage.
There is also a discardable card from the main game called High Altitude Bombing which reads:
All monsters (including you) take 3 damage.
Can Mecha Blast be played after/during High Altitude Bombing to make it do 5 damage instead of 3 to everyone?
If the card doesn't specify that the damage has to come from you it's not considered an "attack". The rules state
If a card deals damage when purchased (like Gas Refinery), this is not considered an attack. Monsters cannot yield Tokyo based on this damage, and cards that affect attacks do not affect these cards.
Since the Mecha Blast evolution does not specify that it effects an attack and since the rules also state that you can use your evolution cards at any time, then you should be able to add 2 damage to any damage that was dealt. In this case 5 damage would be dealt to everyone, including you.
Keep in mind that you must be alive at the end of your turn in order to win.
