Noted Twitter user TAHK0 was one of the first to spot the difference in a now-viral tweet (seen below)
Structure Deck: Blue-Eyes White Destiny is a particularly good example for Blue-Eyes fans, as it is designed around that theme rather than leaving you to chase it randomly through packs
cards are legal
Not only did the name mean "looking back at the past," it had a mechanic that referenced cards that had already been played
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
Only monsters that are strong enough to make it to the peaks of a mountain (Dragon, Winged Beast, and Thunder), can benefit from the effects of this card, which gives a 200 attack and defense boost.