It just requires a vast collection of cards and, thereby, being a whale. Or a nolifer. Or a nolifer whale.
First time standard legend whale out.
There is this misconception that if you don't own all wild cards you cannot be successful. This is very wrong. You just need the 30 best cards in a deck, which often overlap a lot with standard, due to power creep. Then, you need to add 1-2 cards every expansion to your best deck. You can disenchant 99% of your wild collection, if something is not in a tier 3 deck or above now, it will never see play again.