Vaultborn Tyrant is no exception to this either, being one of the better creatures to be released in some time
While there are a few good choices for this, an overlooked one is Arasta of the Endless Web
He can protect himself with a massive dragon blocker or act as immediate card advantage
Teferi, Master of Time I typically avoid planeswalker ults on lists like this because achieving them is incredibly inconsistent, but Teferi, Master of Times static ability makes it much more reliable than most and all the card filtering helps sculpt the perfect hand for those two extra turns
If you do, Kilnspire District deals X damage to target creature or player
Demonic Counsel feels like the best Duskmourn card spoiled so far because its fail case is finding a Demon creature - so building a deck to make that desirable means it will never be "bad," but with Delirium it is a 2 mana spell that finds any answer or threat a player needs