What is good in Duel Links is that you won't be out of Gems most of time (if I don't say ever), since the game is F2P in the first place. I agree, there might be times you won't be able to purchase cards you won't but definitily you will some day (sooner). The disadvantage of that is it is going to be pretty slow that the cards you want at that time won't be effective and will be easily beatable.
It's not true I'm playing another free card game
And now I already have a full collection of all the available cards, 80% of my collection is premium cards!
Here, for free, I can only afford a budget deck like Sylvans or Phoenix.
This number of crystals is simply not enough to buy what the game offers
Yeah, the meta changed so drastically with valiant souls, but u know what? Here in the west almost EVERYONE clinges too much to new trends, if u are not part of the new trend, you suck. What im saying is that u dont really need valiant souls, u can play hazy flames, ssa or cyber angels and still reach KoG.