It can be great for a tokens deck trying to gain life to stabilize or to set up cards like Ajani's Pridemate and Ezzaroot Channeler
The biggest problem with the level-up mechanic is that it's slow (and also sorcery speed, which opens it up to blowouts), so having a way to get level counters onto our creatures quicker than normal is essential
Koma, Cosmos Serpent If your opponent casts a Koma, Cosmos Serpent, it is going to be an uphill battle for the rest of the game
You can get your hands on Lost to Legend for almost free since it was just recently introduced
Kindred The card type previously known as tribal returns, with a bit of a terminology glow-up
Forcing defending players to sacrifice their least powerful creature, this Witch-King variant can be an absolute nuisance to play against