Thats really all you have to do
Polymorph Variant: Key Differences The Polymorph Version sacrifices the creature base to focus on a single creature win condition[[Hullbreaker Horror]] (or [[Tidespout Tyrant]])
Finally, there are the finishers like Katilda, Dawnhart Martyr, and Michiko's Reign of Truth, which grant other creatures or themselves +1/+1 for each enchantment
As is the case with most tribal decks, Merfolk lives and dies by its suite of lords
(Having hit $30 earlier in the season, Ojutai now looks like a solid pickup for the fall if decks that want him can figure out how to get around the sacrifice effects that have rendered him less effective.) The only other cards I offered up as solid picks were Zurgo, Bellstriker and Sidisi, and both saw some good early play before falling off the side of the metagame
This is especially true for formats like Commander, because the cards stick around forever