I suspect this deck could be improved with a lot of Jordan Boisvert's Temur Delver tech: Simic Charm, Disrupting Shoal, etc
Whenever Cacophony Unleashed or another enchantment enters the battlefield under your control, until end of turn, Cacophony Unleashed becomes a legendary 6/6 Nightmare God creature with menace and deathtouch
Legendary Creature - Praetor Phyrexian Color tag templates(None) Sidisi, Undead Vizier Deathtouch Exploit (When this creature enters, you may sacrifice a creature.) When Sidisi exploits a creature, you may search your library for a card, put it into your hand, then shuffle
Selfless Glyphweaver / Deadly Vanity Whether you cast the front half or play it as a board wipe, Selfless Glyphweaver brings a lot of flexibility
The best game actions you can take in Commander are ramping and drawing cards, so commanders that do either or both rank highly