The idea here is I never enter the Tomb of Annihilation dungeon; I simply let Acererack bounce itself and use the other dungeons over and over.
• Your creatures/spells cost 1 (or 2) less to cast
• Double triggers (Panharmonicon)
• "Whenever creature enters the battlefield..." triggers
• "Whenever cast a (black) spell ..." triggers
• "Tap a creature" as a cost (I can tap Acererak as a cost while his bounce is on the stack)
• Flash adders (Vedalken Orrery, etc.)
Click here for a text version of this decklist
Click here for my EDH Commander decks