This is a midrange mirror where hand disruption and recursive threats are at a premium. Bringing in the additional Duress copies gives you a full playset, letting you strip key threats like Unholy Annex // Ritual Chamber and Professor Dellian Fel before they resolve. Qarsi Revenant provides recursive pressure that grinds well in a long game, as a vampire that keeps coming back is difficult to answer cleanly. Ouroboroid and one copy of Ral Zarek, Guest Lecturer come out as they can be clunky when both players are fighting for early board presence and disruption; trimming Ral Zarek to two copies keeps the card advantage angle without overloading on expensive spells. Strategic Betrayal is too situational in a symmetric matchup and is a clean cut.