In the comments, Redditor u/ZombieAladdin mentioned the Heavy Baton as a potential tool for these high-retreat-cost Pokemon
This is part of a series on core cards for playing Commander, focusing on sort of "generic" cards that fit into a variety of decks, based on color identity, and aren't necessarily tied to a specific game plan, but ought to be at least considered for any deck they can go into
This has the advantage of brightening the image, and making the foil image more distinct than on a TCG equivalent
Still, your opponent has to make sure they leave back two or more blockers against him, and if you make them do that, you're still getting a decent effect
With this card being the cheapest on this list, its perfect for spicing up any deck you put it in or just as a collectors card
Its not exactly an explicitly Merfolk-centric card, but I guess the +1/+1 counter synergizes with some stuff