It's highly recommended to place Magnemite onto the Active Spot for the first turn, and wait until you have some Energy attached until your bring Miraidon ex into play
A lot of the on-theme finishers (Meloku, Multani, Avenger of Zendikar, Rampaging Baloths, Primeval Titan) are at a high power level, which is great for convincing the power-max crowd to try it but awkward if you're trying to tone things down
A 1st edition, holo, shadowless Mewtwo could get you around a grand at a grade 9, and a grade 10 is currently on eBay for $3,000
Making a deck in Pokmon TCG Online functions the same as building a deck in the regular Pokmon TCG
So its beyond point 6 of PFMs chart with a general 5ish% or whatever annual growth like before the 2020 boom