Noble Hierarch and Ignoble Hierarch produce a variety of colors and also have exalted
If another creature enters the battlefield as or becomes a copy of Pirated Copy, it will copy whatever Pirated Copy is copying, be a Pirate in addition to its other types, and have "Whenever this creature or another creature with the same name deals combat damage to a player, you draw a card." If Pirated Copy doesn't enter the battlefield as a creature (such as by copying an artifact or land that became a creature), it doesn't become a Pirate, though it still has the granted triggered ability
If you do, put this artifact onto the battlefield
Not to mention if you have multiple in hand
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