In the words(paraphrased of course) of Nancy Kerrigan, "Whyyyyyyyy didn't this happen ? WWHHHHHHHHHHHHHYYYYYYYYYYYY ?"
This looked like a lot love for both properties went into this by the artist. And would've really one upped DC's competition at the House of Ideas with the mess of their Transformers/Avengers crossover. I'm guessing that Hasbro might've been the one to nix it due to a conflict of interest over Mattel putting out DC's characters in toy form.
Also, looking at the portion of that artwork with resident DC badass, Aquaman
, fighting it out with the Piranhacon and SubMarauder. Makes me think of King Nir'Gil and the SubAtlanticans from Atlantis Arise
, and how I'd love to see them again. Last we saw the Seacons was in the second INFESTATION
crossover, they need make a return as well.