Blood Rage fan - Raven Clan
Some battle cards allow you to play them after (in addition to) the first card.
Yep. Theoretically you can even play 5 battle cards in one battle.
Also worth noticing is that apparently, even if you played a quest or upgrade card as the winner, you must also discard those. Sometimes battles come at a very high cost because you MUST play a card if you still have one.