As we all know, the main problem with Hydra Tribal in EDH is that Hydra's don't have a reliable way to get damage through because most of them don't have trample. That is why Nylea is the perfect choice for the commander of this deck! She's indestructible, a good CMC, and she grants all other creatures I control trample. She makes the rest of the deck pop simply be enabling all the damage.
Changelog:
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Doubling Season out → Rampant Growth in (only until I get my The Great Henge): Doubling Season felt like too much of a "win-more" card and slots better into my Ghired deck than into this one.
If you have any suggestions, I'm happy to take them. I already have a list of cards to cut, but I'm happy to hear other voices!