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When The Majestic Duo enters, if you don't control another permanent named The Majestic Duo, create a token that's a copy of it, except it's not legendary, it has "Whenever this creature deals combat damage to a player, draw a card and earnestly tell them good luck," and it loses all other abilities.
Whenever this creature deals combat damage to a player, you and that player may each put a permanent card from your hand onto the battlefield. Offer them a high-five.