I so hate forgetting to change my mark, and I still keep doing it so reading that others do it too, made me laugh...doh
Must disagree with a few of your 10.
#4 I test all my new decks in the real game, I don't even know how to access the trainer
#10 inventing new decks is the most fun.
My top 2 frustrations are
#1 The bad deal. example: with 14 quanta card in a deck of 30cards I only got 1 quanta card in my 1st 14 cards (by then I was dead)
#2 losing 10+ FG spins in a row, I'm still fairly new and i work dam hard to beat an FG