There's an Un- rule that says if you just can't get an outside person to make a choice, an opponent gets to choose, but please make every effort to avoid invoking that rule
If a character has reckless, they wont have any lore value, meaning they cannot quest, and instead must challenge each turn if able
The +10/+0 and vigilance is going to make whatever legendary creature wielding it hit like a truck too
Enchantment In the Darkness Bind Them (As this Saga enters and after your draw step, add a lore counter
However, they can only play 1 Character a turn, so we can control the field and take things to the late-game
Adding 20 cards to your deck seems like a massive drawback that would hamper the consistency of your deck yet Yorion got the ban hammer in several formats, and some Modern decks still tinker with 80 cards, even without the extra creature in their sideboard