Pair him with cards that reward frequent combat like Alesha, Who Smiles at Death or Raid payoffs, and Carnage becomes a relentless Rakdos aggro commander
Red offers incredibly powerful cards for cheap while black brings excellent removal and card draw
In green, Tyvars Stand provides hexproof and indestructible for one mana, but it can also act as a finisher by pumping your creatures power for X mana, ensuring the card is never a dead draw
Its still always going to be a good pull from a pack, though
While this deck zeroes in on the free aspect, you could build a theft deck focusing on casting your opponents spells
check out what that means in our guide to Storyborn, Dreamborn and Floodborn characters