yugioh legend of blue eyes 25th anniversary booster box Yu-Gi-oh! TCG: White Dragon but now Yu-Gi-Oh! TCG: Blue Eyes White

cards are legal

Noted Twitter user TAHK0 was one of the first to spot the difference in a now-viral tweet (seen below)

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As a result, Aether Revolt will be one of the most interesting sets in years because it will contain not one but two card types (here, I'm counting energy as a card type, even though that's not technically correct) that are dangerous, and Wizards likely felt some amount of pressure to "top" Kaladesh with Aether Revolt

Again, not necessarily a Bird lord per se, but still great in (bird pun incoming) dedicated Bird shells