There are a few peculiarities - you attack yourself, effects that target an opponent target you instead, and a few cards may not work like they do in duels or multiplayer
Like any trading card game, this one has rarity tiers, but when you mix ultra-rare cards with special variants like Manga Rare well, lets just say the prices can sail far beyond what youd expect
For more information on these packs, you can check out GoNintendos coverage.
It's also great in typal decks, which we'll see plenty of with Lost Caverns of Ixalan
They did it completely from memory
Phlage, Titan of Fire's Fury follows the design of its siblings Uro and Kroxa, and while it isnt as obviously broken as those two elder giants, you cant ignore that it provides good value