Putting a countered spell on top of your opponent's library caused their next draw step to be wasted, which is far more effective than returning it to their hand
Its going to be an amazing reanimator target in Chainer, Nightmare Adept decks for starters, and in any RBx deck that uses the cheaper reanimator creatures like Doomed Necromancer, its going to perform well
Without many sources of card draw, this deck suffers and can make newer players wonder what theyre doing wrong
This everything but Black powerhouse will get heavy play as a Commander, as four-color options usually just show up well at the kitchen table
So there is one incidental combo if thats your thing, but its a little convoluted and very easy to disrupt
Moraug, Fury of Akoum Extra combats give aggressive decks the momentum necessary to end games and work particularly well with cards that reward you for attacking, like Brutal Hordechief