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That's massive potential card advantage in Commander

Equipment-heavy decks that contain Puresteel Paladin, Sigardas Aid, and Cloud, Planets Champion can also get a big kick out of Slash of Light if used correctly

Mind Over Matter untaps more permanents than just artifacts, so its kind of bigger than this list, but it does specify artifacts so were going for it

This one clearly has Blackblade on it as it's loyalty counters are equal to the lands you control when it arrives to the party

Metalwork Colossus will be free if you have Bosh and another artifact or three in play, allowing you to sacrifice it, use its ability to return it to your hand, cast it for free, and repeat

Cordial Vampire ( Modern Horizons ) Oh, hey Mark