Honestly, I can't see how was able to win this.
RNG has blessed you today, Propheon, you are more blessed than Light itself! 8)
I never drew early arsenic, i was lucky to win 1st game, where i had 1 pillar draw.
Game 4 he had ramping damage, game 2 he survived with 2 hp if recall correctly, and game 3 with 4hp.