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The only way an opponent gets their spell back is to wait three turns which is forever in most games, and irrelevant if they're eliminated

Card names in the decklists are translated from the Japanese product page English names may differ at EN release

1 Urza, Lord Protector + The Mightstone And Weakstone = Urza, Planeswalker The hero of The Brothers War, Urza combines with the two stones that sparked the conflict with his brother, The Mightstone and Weakstone, to become the legendary Urza, Planeswalker

Either way, commander tax increases based on how many times the commander has been cast from the command zone, not on how many times it has returned there