If you need to grab that small artifact from your library, I'd say this is 100% worth it
#8 Captain Howler, Sea Scourge A shark pirate that gives anyones creature +2/+0 at instant speed if you discard
And though it hasnt seen a huge amount of play, that may still prompt some interest in the Water-types potential
There's almost no downside, and putting a card like Ulamog, the Ceaseless Hunger or Karn Liberated underneath Ugin's Labyrinth via imprint only to pick it back up when casting it is easier adds a layer of versatility to the Tron strategy that will make it even more of a threat than it has been previously
Supertypes: How are They Different
The Hydra has tantalizing upside, of course, but Im going to take the safer bet nine times out of ten