Not only does the deck already play Ephemerate/Phelia/Flickerwhisp, meaning you can often keep the Sphynx in play from turn three, but its also an important tool, since Esper topdeck is often dead interaction, and playing Solitude means youre often left with few cards in hand
As a five-color commander, there is a lot of flexibility in how to build a Kenrith, the Returned King deck
As a battle enters the battlefield, its controller must assign a protector for the battle
Vraska's ultimate gets an opponent to nine poison counters, and a single attack or proliferate will finish things off from there
Further to this I have a huge amount of card quality effects so that when you don't have your fixing you can at least go and find it
One way to keep your vampire army alive (provided it's not a 1/1 or a token) is to have Dusk Legion Sergeant on the board