The two most popular decks from the Final Fantasy crossover focus on counters and equipment, respectively
The Thick/Thin refers to the width of the 1 in the symbol
In these decks, throwing away your cards isnt too much of a cost, as youre drawing a bunch anyway, so it really does feel free
It is cheap, does a lot of mill and most importantly punishes the more explosive decks that are typically your worse matchups
If you dont know, Frogadier is the middle evolution for Greninja, and as such gets some decent value for being the connecting piece between the Froakie IR and the Mega Greninja ex SIR
It's odd to see a land on this list, but that speaks volumes about just how obnoxious the power level of Modern Horizons 2 is