ultra rare yugioh card 500 Assorted Cards Including Rare, and Holographic Cards : Toys & Games Shuffle 1 card your opponent controls into the Deck The Most Valuable Ultimate Rare

Goblin Matron searches your library for any goblin card when it enters the battlefield, then puts it in your hand

If you just want a serialized card to say you own one, however, and you arent particular about which one you own I say wait

Mantle of the Ancients The ultimate recovery tool for late-game Voltron players

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Recently, this card sold in an auction for over $25,000

Mount Doom, a red-black land that hurts you when it makes mana, can also hurt your opponents and act as a board wipe if you sacrifice it and a legendary artifact (like The Ring)