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Stop wondering

Notably in a build summoning "The Unstoppable Exodia", "Divine Dragon Knight Felgrand" can be used to stop a non-"Millennium" monster from being shuffled back into the Deck

Once Marksman attacks, its effect will activate, Special Summoning your second Atlantean Dragoons from the deck

[Update: a third Balrog was actually just revealed today in one of the Commander precons!] Lots of characters in this set will have multiple cards, including the Aragorn also in this secene, but I asked Cartagena why the Balrog specifically got to triple dip

As a reference to the real-life mechanic, characters sometimes mention these cards to be "legendary" in-universe