You'll be able to dispatch the boss quicker
Whether it's ShaileShaile to provide counters, EmbroseEmbrose as removal insurance by drawing you cards, Lae'zel, Vlaakith's ChampionLae'zel, Vlaakith's Champion to give you even more counters, ElendaElenda to provide a board presence once she dies, or FelissaFelissa to turn your legends into Inklings when they're removed, all of these legends not only fuel the +1/+1 counter game with ArdbertArdbert, but synergize with it in excellent ways
The goal of the deck is to play creatures and slap counters on them with cards like Maester Seymour then reward you for doing so, drawing you cards with Bred for the Hunt, giving them keywords with Sphere Grid, or protecting them with Inspiring Call, all while your creatures to continue to grow and bash in for more damage
Jumping up to Final Fantasy XIV now, Graha Tia actually looks really interesting for multiple formats
If Piglet - Sturdy Swordsman ends up on the board alone, it can challenge ready opposing characters, giving it an interesting offensive edge as well