Its intimidating crystalline structure and the gleaming light it emits make it one of the most distinctively designed Pokmon of its generation
Although I find myself tapping my upper thigh more often than other people probably do, a wallets ability to disappear from consciousness is worth that awkward tick
The nice thing about this set compared to Obsidian Flames is, that this does have 3 Japanese sets mixed in, with Obsidian Flames this was only 1 set
It's here for the latter, which is also a Relentless Assault variant for another mana
Power level wise the card fits in just right in Modern, as there are a lot of threats which go under the card, and cards like Veil of Summer and Cavern of Souls give slower creature/combo decks enough counterplay against it
Mark Rosewater has gone into elaborate detail on double-faced cards on his Drive to Work podcast - I would recommend checking this one out for the history of the mechanic