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Old Gnawbone Old Gnawbone is a green Treasure factory

This Alpha artifact, released in 1993, offers an incredible ability: "Tap to gain an additional turn." While the card originally required skipping a turn as a drawback, clever deck-building soon turned it into a game-breaking combo piece

However, there have already been numerous presales, which all stayed right around the same price TCGPlayer lists it at, of $389.99 USD

and even Aboleth SpawnAboleth Spawn so you can enjoy copying triggered abilities of your opponents' creatures

In Limited, this could be your win the game if it resolves card, and its readily available from the command zone

There are two other important factors at play here