how many of one card in mtg deck

how many of one card in mtg deck legendary cards can be a Magic the Gathering deck? Post Malone buys one-of-a-kind Magic:

Name: how many of one card in mtg deck legendary cards can be a Magic the Gathering deck? Post Malone buys one-of-a-kind Magic:
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SKU: 51480513522
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SKU: 51480513522

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USD21.13 USD69.13

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Description

This color has many powerful tools to ensure your EDH or Constructed decks wont run out of gas anytime soon

That seems like relevant text for Standard, and flavorful for outlaw-themed Commander decks

Each will be available in both English and Japanese with both foil and non-foil variants with various bundles going up to the "Master Rank Everything Bundle" that includes, well, literally everything from the superdrop for $559.84

The power level of this set is quite immense, potentially more powerful than MH2, and all the cards mentioned today have the ability to impact the meta substantially