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Life gain against aggressive strategies, card advantage against decks wanting to grind, mana to give you a needed explosive turn to catch up these are just some of the most useful functions it serves in different spots

And as @swolepoke mentions below, they arent hiring forensic-level analysts

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* Synchro: Return, from the Graveyard, 1 Tuner monster used for the Synchro Summone of a "Zodiac Dragon" you control to the Deck

If future generations of Wizards employees want to circumvent the reserved list while still obeying the letter of the law, their best bet is to print new cards that serve similar roles to the old ones without being functionally identical