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Walmart's online inventory updates aren't perfectly real-time

They do remove it from the board, but only temporarily

(Source: Sold Unlimited Armageddon) How to Identify Fake Unlimited Cards

The comparatively high costs of the dragon creature cards can be absorbed well by the high mana count in the deck, further support is provided by the Dragonmaster Outcast, the Dragonspeaker Shaman or the Dragonlords Servant

Magic Companion lets you automate match results, use a built-in life counter, and get notifications of new rounds

The only real downside is being mindful not to monopolize the game by taking a turn during everyone else turn, but as DJ Khaled says, that's just suffering from success