Both Aristocrats and Reanimator decks are going to want this yesterday, and possibly even all black decks in general
The five colors in Magic would be better-represented by mana symbols than by nondescript circles of color
Ah, and you also amass a big creature out of the deal
While Gut, Brutal Fanatic can be a fun and flavorful addition to such a deck, there may be more efficient cards like Judith, the Scourge Diva or Mayhem Devil that offer better value and impact on the battlefield
Paying four mana to draw one card seems like a terrible rate, and by all means, it is, but there are two crucial things to consider before you dismiss this card: the mana cost is entirely generic, and it can snowball fast
It adds 2 damage to every red source you control, making little pings brutal