Depending on your decklist and opening hand, this can possibly even be an FTK
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)
(You still need the necessary Energy to use each attack.) PCPower Move Search your deck for an Energy card and attach it to Mew ex
The Seat of the Empire can channel for three mana and shoots an attacker or blocker for four damage, which is nice added removal since we don't have that many removal options in the deck
I like this better than some other Equipment out there, such as Tormentor's TridentTormentor's Trident, but that's not saying much
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