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My best guess is somewhere around the $200 mark

making 3 mana and drawing a card and damaging an opponent and so on

For six mana, Muldrotha does quite a bit where during each of your turns, you may play a land card and cast a permanent spell of each permanent type from your graveyard meaning you can really leverage your graveyard to accumulate a ton of value during games, perhaps with an Overlord of the Balemurk on the battlefield for good measure

This likely symbolizes the fact that in the anime, it is the combined form of the Chaos Over-Hundred Numbers, and was Xyz Summoned using all seven of them as Xyz Materials