Can make a character viable to play rather easy with the prism shop but wont be amazing without master artes or mirrors. Grade shop is one of 2 mercy systems at play when doing multipulls. Amazing system if you get repeats; if you max out a mirror and get it again youll get a currency that lets you random pull for a mirror or save up and you can pick which mirror you want.
Go into it with a plan of who you want and focus on 4-5 characters and slowly work your way up to getting others as you play.
Every character is viable and while every arte isnt it does come down to personal preferences and play style.
Events have just the right length (about 2 weeks), wish there was a 1 day downtime between each event/new story chapter, but its not too bad.
Have gone 3 events without getting something nice/new (thou i dont pull for every event as i dont care for every character), then get a ton of swag in the next event with free pulls (with the current event I got 2 master artes and 3 mirrors; 2 of the mirrors were for the same character and the other i had maxed already but still got 3 mirrors).
Some of the newer master artes and mirrors have a much lower drop rate, which is a bummer.
Whales are here and make you feel weak but there is no pvp so its more a feeling of being a kid with a stick vs someone with a sword.
No pvp, but there is weekend coop which is actually a lot of fun (its not every weekend but it doesnt need to be). You get to pick from a roster of characters then from those you get 2 at random and go in with 2 other players and you 3 have a timed arena battle and you get graded for how well you do. Wish more games did this.
Biggest drive (and how they get you to spend money is) to get the characters you like and become better at the tower and challenges instead of trying to be better then others/whales.
Not every new arte or mirror is game breaking, and some 3☆ items are better then some master artes; i still ha e 3 characters who use 3☆ items bc they are better. Same goes for crossover characters.