I give up when i simply dont like to play against the rivals deck, whenever i dont like the mechanics he/she uses. (for example i tend to quit against a card like aegis when i see people taking 3 minutes to decide what to do with it ...)
Or when i just dont have the mood to counter the rival deck with a lack of options.
- DF overbuff which drags the game out a lot, i sometimes just dont feel like spendin the time trying to take down that amount of HP/DF
- or when i play big stuff and i know the other guy has counters like fierte, assa SS, i dont always feel like trying to dodge all that stuff
Alteil is pretty much well balanced. Sometimes you loose and sometimes the enemy wins.