While it locks you out of summoning for the rest of the turn, you can simply wait, to make that your last play that turn anyway
I would rate lower (that's how much I hate the latest update
That said, Lurrus of the Dream-Den pre- Companion errata is considered to be the best MTG card ever solely because it was banned in a format that encapsulated every card in MTG history
As of the making of this blog, its ranked number one in the world for popular decks, with a bunch of Snake-Eyes sub decks scattered into the listings
Karn was already a powerful card that gave any deck access to a bunch of silver bullet options in the sideboard, but having one of those options be an auto-win in many scenarios was a step too far
Once per turn, if your opponent has 25 or more cards in their GY: You can detach 1 material from this card