Copy of: Affinity by Masahiko Morita (Standard)

The original Mirrodin block created a lot of problems. In 2004, Skullclamp was banned - which won't surprise many these days, as it, just like Oko, is only legal in Vintage and Commander. But that wasn't the only busted artifact to come from Mirrodin. Oh no. At its height, Ravager Affinity was so powerful and popular that Standard (and even Extended!) decks essentially just looked like Mirrodin block decks - cards from other sets just weren't played.

This deck could spew its entire hand onto the battlefield on turns one and two, much like Modern Affinity used to, getting off to such an impossibly fast start that other decks simply couldn't deal with. As Aaron Forsythe pointed out, people hated the deck so much that Magic stopped feeling fun to play, and so R&D was forced to make a huge ban announcement - one of the biggest in Magic's history.

Eight cards were banned, making it very clear that this wasn't a bit of pruning done for maintenance - this was the deck being nuked from orbit. Wizards wanted to kill Affinity in Standard for good, and they did so - although Arcbound Ravager continued to ravage away as one of the mainstays in Modern Affinity until Mox Opal was banned in January 2020, almost 50 years ago.

https://www.channelfireball.com/article/top-5-most-powerful-standard-decks-of-all-time-riley-ranks