The mode is called "Pack Rush" and while it initially debuted at Disney Lorcana TCG Challenge events this summer, it is now being detailed and explained, so anyone can play it at home
Great diversity overall
(8/7/2020) Permanents put onto the battlefield due to Karn's ability will have been under the starting controller's control continuously since the beginning of that player's first turn
(I should also mention that this doesn't include reprints, so fetch lands are counted as Zendikar cards, not Modern Horizons 2 cards, so they aren't skewing the data.) While Modern Horizons sets add a lot of interesting new cards to the Modern format, at this point, it's clear that they also add a lot of expensive cards into the Modern format, which in turn ends up increasing the cost of playing the format
Sometimes we have a lot going on, and remembering to get a present for someone can slip your mind
Transforming it into Ravager of the Fells can remove creatures