Im on like stage 55 or so. One of the challenges is to deal 300k of effect damage lol. Its fuggin brutal but im 2/3rds of the way there.
I built a fast burn deck just for the sake of it. Can deplete cpu duelist in 6-8 turns. But i think im gonna switch to gravekeeper vasal and buff him so he does 10k in one attack.
Thank god for bamboo sticks making makeshift decks like this so much faster.
I did that without Vassal, as I traded it early when the game was released... I think I used a Kickfire deck to do that and the "deal 3000" effect damage or so challenges.