Maralen of the Mornsong combined with Opposition Agent plus Ob Nixilis Unshackled creates an unfair playing environment. Put those cards, plus some discarding synergy (Tinybones, Trinket Thief, and Thoughtsieze) along with removal and recursion in a deck with too many lands and you can win easily. In fact, turn 1 Jeweled Lotus, sacrafice it to cast Maralen, put down a swamp, cast dark ritual, and cast opposition agent. Land destruction (if available in black) would also be an optimal choice.