All this talk of cantrips and how they affect Legacy, and I still havent really talked about the elephant in the room
Sorcery Color tag templates(None) Three Visits Search your library for a Forest card, put it onto the battlefield, then shuffle
Another thing to consider is giving Bladewing double strike, with Lizard Blades being perfect for this since its an Equipment thats also a creature
Between Your best openings will include I hope you enjoy the Lifegain deck out of the box
Sure, there are other moist creature types out there, but Merfolk are pretty consistently hard to deal with and incredibly powerful, and what more can you really ask for from a bunch of Creatures that like chilling out on river beds and stuff
Get it at market for $21.26 but not much lower