Over the full duration of a Mastery period (usually spanning the time between major set releases), free-to-play players can earn dozens of packs without purchasing the premium pass
The white-blue archetype has a "Knights matter" theme, so this card was designed to play into that archetype
If there are any Zombies on the field, it gives the added bonus of exiling those in the process
As for Shirahoshi, shes a 4-cost Blocker that gives one of the opponents Characters -4 cost-reduction, perfect if you follow her up with 5-cost Egghead Luffy to KO a high-cost Character
Powerboard If you love your deck as it is, but you feel its not quite the right power level, you dont necessarily have to change the deck entirely
But not all Japanese editions are expensive