If you want to build around merfolk because you picked up a Commander precon from The Lost Caverns of Ixalan or just want to learn more about one of Magics longest-running creature types, Ive got the best merfolk for your deckbuilding needs
You can then play lands and cast spells from their hand
Best Card Selection Payoffs There are cards like Delver of Secrets that flip into powerful threats with consistent library stacking, while others like Thassa's Oracle or Goblin Charbelcher turn precise card selection into combo wins
Whether Formidable Speaker proves to be a strong enough tutor to see play alongside the likes of Green Suns Zenith, well just have to see (it does tutor Nomads en-Kor for the other piece of the combo, which Zenith cant do)
If you have 2, you can go for a reanimator plan
Personally, I think my quest is satisfied for the time being