While there are lots of others you may want to run as your commander, if you want to run a bunch of cool dragons, Ur-Dragon is king
Grand Architect Turning other artifact creatures into functional Vodalian Arcanists is pretty good, even if Grand Architect is a bit durdly
Nemonas Special Illustration Rare card from Paldean Fates is going to set you back about $20 to $22
(Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.) At the beginning of combat on your turn, if you have a full party, creatures you control get +1/+0 and gain indestructible until end of turn
When you resolve a Price of ProgressPrice of Progress with Niv-Mizzet, VisionaryNiv-Mizzet, Visionary in play, you realize two things, almost instantaneously: One, you're going to win this game
Priority 2: Thoughtseize their curve