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
4 Dance Of The Elements Ashling, The Limitless Don't be fooled by the low card value in this deck, because I've seen this precon in the hands of both new and experienced players and had my ass handed to me regardless
The legendary treasure that can undo death itself." Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pauper, Pioneer, Timeless, Vintage Alchemy, Standard
Sabrina is a particularly useful card in this type of deck: your opponent may swap a low-HP Pokemon into the Active position to protect another one, but you can use Sabrina to push it back to the bench to be KOed by Blizzards effect
If you have 4 or fewer Benched Pokmon, this attack does nothing
Now, they have legs but there were years when there were no Merfolk being made, so of the four biggest creature types from the first set, they have the fewest numbers because of that