i havent tried the 'trading' part yet - i just started a long time ago (almost from the beginning)
i have just been buying and holding - i have only bought a few packs to open here and there
(i do have 100 chaos packs and 100 riftwatches packs i have just been sitting on)
almost all my cards (2300+) are from daily rewards
i might be taking advantage of the next pump on card prices and take some profits
i should look into rental market a little more but im heavy studying atm so not a lot of spare time.