It's like a competitive Pokemon battle, basically
I recently sent off two of these to PSA and they both came back a 10
The Wind Crystal Not all white decks want The Wind Crystal but any that have a reasonable amount of lifegain, or spells beyond four mana really take off with this legendary artifact
They both manage to offer beneficial deals on average that are liable to swing the game in either direction without the utterly ludicrous effects that Fiery Gambit needs to function
But more neat is that it's an enchantment, so Enchantress decks might want to run it as a thematic counterspell, fetching it with Idyllic Tutor, maybe getting it back with Crystal Chimes
As soon as the doors slide open, they charge in, causing chaos while running towards the section displaying the Pokmon cards