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
I think that it is quite average besides its move called Do the Wave and as long as you have a full bench this card can be quite powerful and do a substantial amount of damage with only two energy cards, you'll just have to watch its hp since it only has 90
Chart shows the price of Gilgamesh, Master-at-Arms #139 at the end of each month going back as long as we have tracked the item.
These are all of Ditto's valuable cards that you'll want to get your hands on
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That is, paint them awesomely