mtg duskmourn showcase cards Enduring Curiosity (Japan Showcase) [Duskmourn: House of Horror] where X is the number of card types among cards in your graveyard. The Mana Math of Duskmourn:

Its triggered ability is quite saucy

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Swapping the creatures in each players graveyard with the ones they have in play can completely flip the game in an instant, assuming your army of the dead is the most powerful one at the table

The 'Top Tier Pro' estimate is what I used to estimate an upper bound (yes, one could make the argument that they maintain an 80% winrate all the way until Diamond, but I have to stop somewhere)

All of the starter decks so far have had a Rare and a Super Rare for the foils, and Pan is a Rare

This means that if Admiral Beckett Brass is paired with many of the other offense-heavy Pirates on this list, it can be used to steal your opponents' most powerful and game-winning cards indefinitely.