mtg dungeon deck commander Adventures in the Forgotten Realms Decklists sized copy of the commander card on thick cardstock Dungeon Delver · Commander Legends:

This could theoretically be used repeatedly with the right combination of cards, and while it has a few hoops to jump through in order to make it work (for example, Entombing your Protean Hulk), it ought to do the trick

Beverly Crusher, Ensign Boimler, Ensign Mariner, Khan, and Trelane all have Legendary Creature cards that can front a Commander Deck, and those are just the ones revealed so far

These are one-time shots, or so it seems from what's been previewed so far

Glacian's disease continued to accelerate until Yawgmoth removed the sliver of powerstone, replacing it with the two halves that had been used to open the portal to Phyrexia while Rebbec created an infirmary on the surface of the plane for him