While Dread Return looks like a four-mana reanimation spell, the card's real power is its flashback ability, which allows you to cast it from your graveyard for free by sacrificing three creatures
Diablo is already fetching a high price, and that most likely is due to the hype it is getting from players
Some other outlaw payoffs include At Knifepoint to grant your assassins first strike, Back in Town as mass reanimation, and Double Down as a board-widener
They are corner radius is 2mm instead of 1mm, as is now standard for all tournament legal cards
Plus the deck has a ton of standalone strong cards in case Plan A isn't working, like the mythic saga cycle
In many ways, this card defines the Modern metagame