for Level 8 ("Superbia", "Zerato", "Nergal" and "Asmodeus") there are "Archlord Kristya", "Invoked Augoeides", and "Flowering Etoile the Melodious Magnificat" and for Level 4 ("Indulged", "Capricious", "Djehuty"), "Herald of the Arc Light" is the optimal choice
You might not find yourself assembling Tron often in Commander, but the format has so much ramp that you can play this colorless planeswalker with little trouble
In the Darkness Bind Them In the Darkness Bind Them is a good addition to a deck using one of the Grixis Sauron cards as a commander
You can use the lore tracker included with the Disney Lorcana starter decks, the games official companion app or simply another way of counting to 20, such as a dice or piece of paper
When a card has phasing, it phases out at its controllers untap step, and then phases in at that player's next untap step