Mechanically Unusual Fighter: When creating her deck, she gets to choose from four different unique Discipline assets which boost one of her stats and provide her with a powerful ability, which has the cost of forcing her to flip the card over to its "broken" side, disabling it until specific conditions are met to turn it back (or she draws an Elder Sign)
Aster declared that he would talk to Yuya using the Lancers' card, and he powered up "Dystopia" through various means including the "Double Attack" Action Card that he had taken from Yuya, but Yuya countered with "Miracle Fire" to copy the effect of "Double Attack" and won the Duel
Depending on your decklist and opening hand, this can possibly even be an FTK
When paired with Lorcana cards that can heal him or any other character with the Support ability (adds their strength to a chosen card when they quest), Olaf can actually become a very powerful card very early on
The spells and trap cards should cover for the weaknesses of your deck, and you should have a handful of each of the following: attack protection, effect negation, summon negation, spell/trap destruction