Explore the icy expanse of Kaldheim with the return of snow lands and powerful snow mechanics
There are not a ton of large threats, making it harder for your opponents to choose which permanents to get rid of
There is a multitude of payoffs for both tribes and things like Diregraf Captain, Wayward Servant, Undead Augur, Vodalian Wave-Knight, Knights' Charge, and Exsanguinator Cavalry help the rider shine even brighter
You also see Emrakul appear in Modern in Mono-Green Tron as a one-off for the late game
Being able to give all of your permanents (and yourself) hexproof at instant speed for a single white mana is pretty powerful, but it also comes with damage prevention for black and red sources
(1/24/2025) If you copy a double-faced creature, Altered Ego will be a copy of the face that's up when Altered Ego enters