That is, it doesn't matter how long it's been a creature, just how long it's been on the battlefield
The Thopter theme felt like a good fit for the blue/red feel, and the idea was that while it was a little of a stretch for red, it wasn't fundamentally breaking anything
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Ainok Tracker Akoum Hellhound Arcbound Tracker Ashmouth Hound Blazing Hellhound Blood Hound Bolt Hound Carnival Barker Chandra's Magmutt Deer-Dog Dogmeat, Ever Loyal Edgewall Pack Enduring Courage Equilibrium Adept Fiery Hellhound Goldhound Hellfire Mongrel Hound of Griselbrand Igneous Cur Karplusan Hound Komainu Battle Armor Kroxa and Kunoros Lava Hounds Lightning Hounds Mad Dog Mogis's Warhound Monstrous Hound Pack Mastiff Pako, Arcane Retriever Pyre Hound Rakdos Ragemutt Rin and Seri, Inseparable Scrapyard Mongrel Slumbering Cerberus Summon: G.F
Energy budgets can be tight, but the Izzet Generatorium also helps out by providing an extra energy counter every time you gain energy
UB is a strange color identity for a sea creature deck, but Runo presents a fun mini-game to get it flipped, and Krothuss, Lord of the Deep is one of the best sea creature payoffs you could ask for