Dragonologist Dragonologist does a little bit of everything you want early on: It digs for dragons, instants, or sorceries when it enters, and then once you start dropping your dragons, it gives them hexproof as long as they stay untapped
Hail, Caesar Deck: There's also the Hail, Caesar deck, featuring the franchise's infamous Caesar as your commander
If you want to experiment a little more, you can pick your 5 favorite three-color combinations and do some mono-color decks too, taking you up to 20, which feels like a nice stopping point
Chaos: Whenever you roll Chaos, put a Legendary artifact equipment named The Ashbringer with Equipped creature gets +5/+5 and has First Strike and Vigilance, Equip 3, and Sacrifice this permanent when a player planeswalks
Introduced in Modern Horizons 3, Ripple Foil proves that new forms of Foils will always fetch a high price