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You cant cheat out expensive cards, but Gandalf adds some super-charged Panharmonicon action to your deck and at minimum gives your commander flash

Myr Galvanizer adds counters to all Myrs

Having a recurring creature can be good with sacrifice outlets such as Vicious Offering and Whisper, Blood Liturgist, to say nothing of Siege-Gang Commander

What are you exiling to this

If you can solve this the value is insane, and it can certainly set that up for you

One thing to be aware of is that you may pull some Commander-only cards out of Collector Booster packs, so you'll want to check the set symbols before building Standard decks