>>530875345
Don't there's no reason to whale in this game unless you want to play more than 2 decks or just need to get a ticket. This is my current state after spending like 14+k vials to finish a rune deck. I have 20k vials, 30k rupees, and like 30 keys. You can have 2 finished decks of your choice without really swiping. Pack of 77 cards means you won't have a problem finishing sets for the next month and a half.
I only invested in battle passes for a year which comes up to $7/month on a jp account