i'm a big fan of the ukiyo-e style art treatments of cards in the Strixhaven Mystical Archive set.

Far from the best, but it's gotta be Jared - my first 5c commander. Played the precon a bit, and also turned him into a 5c +1/+1 counter pile.

Six-drop Saturday! Infernal Sovereign is an absolute unit.

Niv-Mizzet Supreme, my personal favorite. Far from the best, but my first love has and will always been spellslinger and this card lets me play all of the janky 2c interaction that other decks often overlook.

Close followup - Jared Carthalion, as the face in a colors-matter +1/+1 counter pile

Cost reducers as a form of ramp. These are often overlooked as far as threat assessment goes, and really accelerate your game plan. While the creature-based ones will be blown out by a board wipe, if your reducers accelerate non-creature game plans it can still be worth it!