Card seems wildly good. Most effects with similar abilities say you can't quest for the rest of this turn. You can probably reasonably expect this to gain you 6-8 lore in a turn if your opponent doesn't remove it immediately. Or you can just challenge with it and wipe boards. Versatility is very nice. I'm excited to see what else is in the set if this is the level of power we can expect.
I'm wondering if this is the first card to allow actions not on your turn. If you're playing 3 or more players. Player A (you), player B, and player C. If you quest with beast your turn, and then player B does damage to player c, do you ready your beast during player B's turn?
This also means your opponent can't target him with 2 characters because he will ready after the first challenge, provided they take damage in the challenge