It's not the best card in current pool about staying ready before defending. But it's gets keyword response. Not forced, so it can be very versatile Rank: B+ (one copy in many of protection decks even today can be a ok option.
Response: After your hero defends, discard indomitable → ready your hero.
"We have no choice. So we fight — and we win. There are no other options." — Captain America
Core Set #82.