It spreads rad counters to all players and once they start milling cards due to the radiation, you make some 2/2 mutant zombies
These stun counters are actually Claustrophobias in disguise
They're amazing in the deck but if your playgroup hates it then swap them out for something else, like Howlpack Resurgence, Master of the Wild Hunt, Worldly Tutor, and Finale of Devastation
It isn't any specific cards that have really changed things, Fatal Push would be the biggest contributor if I had to name one
Zara, Renegade Recruiter lets you steal creatures right from your opponents' hands, which gives you a chance to swipe powerful ETB triggers off creatures like Etali, Primal Conqueror that other threaten effects miss
These modes are less daunting than drafting, as they allow players to bring in their decks rather than create them as part of the event