While I personally have a soft spot for anything horror-themed, this set played things relatively safe from a mechanical standpoint
Legendary creatures are incredibly powerful, especially in our modern era of Commander-centric card design
The other cards in the drop were Wrath of God, Preordain, Decree of Pain, and Gamble, and they each feature art that evokes vibrant, psychedelic-looking concert posters
These riffs on Phyrexian Arena make you pay life instead of lose it, and they provide upside beyond drawing cards
When you beat Ursula in Deep Trouble, you can open a specialty pack that has a unique foil card in it!
It could return virtually every non-land permanent an opponent controlled in one fell swoop (and there are stories of people using Aurora Griffin to return the lands as well!), turning a stalemated game into an instant-win with your hordes now free to march unopposed through enemy territory