Good, I have the archetype ID and card ID. Now let me get the archetype cards and query performance splits with and without Mossborn Hydra in the main deck.
Hey @Zacktrack92, the data gives a pretty clear answer: the version WITHOUT Mossborn Hydra in the main deck performs better.
Over the last two months across 352 Standard entries, builds running Mossborn Hydra maindeck posted a 52.9% winrate (253W-225L), while lists cutting it from the main posted a noticeably better 55.3% winrate (436W-352L). That is a meaningful 2.4 percentage point gap across a solid sample size of 352 decks total.
Mossborn Hydra sits at only 36.65% maindeck presence in the archetype, appearing in roughly 1 in 3 lists and averaging just 3 copies when it does show up. The core of the deck is extremely locked in: Fabled Passage, Sazh's Chocobo, Llanowar Elves, Icetill Explorer, Ba Sing Se, Earthbender Ascension, and Mightform Harmonizer are all near 100% staples. Hydra is a flex slot that the data suggests you are better off leaving in the sideboard or cutting entirely in favor of more consistent threats like Surrak or the additional protection pieces (Royal Treatment, Snakeskin Veil).
Sources: Data drawn from 79 Standard tournaments (73% MTGO, 27% Melee) over the last 60 days.