decimate dragonlair spider stormbind anger reflection saproling symbiosis all good options to consider
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spirit mirror + conspiracy = kill all creatures
mikaeus the unhallowed + murderous redcap + viscera seer = infinite damage
helm of obedience + Planar void/leyline of the void = infinite mill
parallax wave + opalescence + triskelion = infinite damage Parallax wave can target its self when opalescence is out, so you start by taking one counter off and targeting its self , then you respond by activating wave's ability to target triskelion (after unloading the counters to shoot things with). It resolves like triskelion is exiled, then parallax wave leaves play, returning its self and triskelion to play, both with full counters.