Infinite Commander Casts with Geode Golem and Myth Unbound

Step 1: Have Geode Golem, Myth Unbound, and Cloudstone Curio on the battlefield. Commodore Guff is your commander.

Step 2: Attack with Geode Golem and deal combat damage to a player, triggering its ability to cast Commodore Guff from the command zone without paying its mana cost.

Step 3: Use Cloudstone Curio to return another permanent to hand when Commodore Guff enters the battlefield.

Step 4: Repeat the process, casting Commodore Guff infinitely, triggering any enter-the-battlefield or cast effects, and dealing damage with Kediss, Emberclaw Familiar.