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That isn't why it's valuable it's a shiny Mew as a gold secret rare, and it's a total collector's piece but it is cool that Celebrations can be played with as well

Jodah also "cascades"when casting a Legendary spell with Jodah in play, the player exiles cards from the top of their library until revealing a Legendary spell of a lower mana cost and casts it for free

This page shows current market prices, recent eBay sales, PSA graded values, and price history for this Rare card from Platinum

It won't change a roll of the planar die, but you might get to say something like "I rolled chaos plus 2," which is a pretty cool thing to say