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While you can use basically any card as your commander still (except for a few choice powerhouses), some are going to be a bit more fun than others

Raised by Giants Raised by Giants has a pretty high mana cost, but once its out, your opponents will have to deal with a beefy 10/10 commander

Also, you may want to consider either Ghostly Dancers to be able to reuse your exiling enchantments or Rest in Peace to shut down your opponents' graveyard interactions

Stack multiple copies using recursion or copy spells

However, ultimately there are a lot of powerful commanders out there, and your commander is the one face-up thing everybody knows before the game started