This is the latest in the series of cards with a similar effect; 2ER upgrade, Response: satisfy a condition, discard this card > ready your hero, such as Battle Fury, Justice Served, or Indomitable. Ready to Rumble is basic so it complements any aspect. Every hero can satisfy this by flipping from alter-ego form to hero form. Heroes that like to flip such as She-Hulk can find a use for this card. Heroes with multiple forms such as Spectrum or Ant-Man will get the most out of this card. As more flipping heroes are introduced this card will increase in value.
Basic
Upgrade
Condition.
Cost: 1.
Resource:
Play under any player's control. Max 1 per player.
Hero Response: After you change form, discard this card → ready your hero.
The Mad Titan's Shadow #22.

- Ready to Rumble Mutant Genesis #51
Reviews
I think that it's worth noting that the true value of this card is the less valuable exhaust of the two forms.
—
Rocksteady1986
· 21
The way to look at this card for heroes that don't have multiple forms is basically to consider your REC + your hero stat activation for the cost of 1 and the card. That is not too bad for those using their basic REC a lot. It goes very well with Down Time. It's good in that you can play it and then use it whenever you like.
Alternative uses include alter-egos with some kind of exhaust ability. I love this on Ms. Black Panther. Having the ability to exhaust and play an upgrade, then immediately flip to hero form, ready and use that upgrade can be very good.