The Magic: The Gathering Marvel Secret Lairs released on November 4 included small batches of cards featuring five superheroes: Wolverine, Storm, Black Panther, Captain America, and Iron Man
It also gives all of your creatures an ability that makes it so that they get +1/+1 counters on them whenever they activate a mana ability, equal to the amount of mana they created with that ability
Conclave Mentor's first ability doesn't apply to itself if it's somehow entering the battlefield with a +1/+1 counter on it
Very little setup is required and players will simply follow along in the instruction booklet step-by-step to learn the game
But the choice of art in some of them has also caught a bit of flack, like the big ol Ozai face on Cruel Tutor
In my experience, the Game Changers that win the most games are the ones that generate persistent card advantage: Rhystic Study, Smothering Tithe, Necropotence