The key Mythic Tricks that require a high skill level from you are UMD (you gotta be able to actually use the items), Persuasion (Rank 1 is just demoralize and doesn't run on rank, so its good to have a high skill), Athletics 1 and 2 (Athletics check into Saving Throws), Mobility 3 (Mobility checks into AC), Knowledge World 1 (World Checks into boosting every other check).
If it's true that Trickster's secret metamagic feat can turn level 1 spells into cantrips, I guess an Arcane Trickster Trickster can use Surprise Spells to magic missile 5xSneak Dice every fight. Just a silly thing you can do.
Arcana seems too good to pass up, no skill needed on MC. R2 adds traits to everything you find, so any weapon can be Demonbane, or elemental etc. Armor too, +4 stuff turns into +6. Every party member gets multiple bonuses, and you can just respec out of it after you're bored.
And the qualities can be savescummed if desired.
I think Trickster benefits a shitton from re-speccing.
Mythic Rank 3 - Grab Arcana 1
Rank 4 - Grab Perception 1 and 2, grab with special trickster feats you want, respec into Arcana 2
Rank 7 - Grab Arcana 3
and, as an example, Rank 9 - respec out of Arcana 3, grab Athletics 2/Mobility 3/UMD 3/World 2
Now you have the best equipment in the world and the """AC"""/""""Saving Throws""""/Spellbook of a demigod boss tier fight regardless of class.
I also forgot to mention Trickery - the actual instakill Mythic - and Stealth. The latter's usefulness is a big of an enigma to me because it depends on wether True Sight just dispels it outright.
