Two of the easiest upgrade paths would be to head toward a big artifact / reanimator strategy with cards like Goblin Welder, Daretti, Scrap Savant, and other huge artifact finishers like Wurmcoil Engine, or play a token- / Thopter-themed deck with the help of cards like Sai, Master Thopterist, Pia and Kiran Nalaar, and friends
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While Goremand offers a strong effect with its flying, trample, and opponent-sacrificing abilities, there are potentially better options like Grave Titan or Massacre Wurm that provide more immediate impact or value for the same mana cost
This is reasonable on-rate card draw that sticks around to cut away at life totals