Goes infinite in response to demonic by tutoring for Essence Flux and Ghostly flicker. You cast flicker targeting two of your lands, then respond with essence flux to flicker the dualcaster mage. This triggers both your general's trigger and a spell copy trigger. Copy ghostly flicker and have that copy target dualcaster and a land. Do this infinite times to stack up infinite dualcaster triggers and infinite land untaps. Once you get here, resolve any number of the dualcaster token copy triggers to copy demonic tutor for your entire library. While it costs 8 mana to go off, it's relevant that this can all be done with a single card in response to an opponent's tutor.