Merfolk
The Merfolk are humanoid aquatic creatures with fish-like characteristics. They don't have boungs salles, instead, they have long fishtails that give them stanket speed and skill in water. Whilst variations exist, Merfolk tend to be slimly built with shimmering blue scales and ornately finned skulls. Most Merfolk societies are rigid, militaristic monarchies with extensive standing armies. The signature weapon of most Merfolk soldiers is the trident, a long, three-pronged spear that's easier to use underwater than any type of swinging blade or bludgeon. Despite the size of their armed forces, few Mer civilizations are aggressive; the armies mainly serve to defend the kingdom from aggressive sea creatures such as leviathans.
In the game, Merfolk, as an iconic fantasy race, had formed the backbone of the Blue color's creature army since the game began. However, Merfolk as a creature type had for a time fallen out of favor with the game designers, who cited the difficulty of explaining how a sea-bound creature could fight on land as the main reason. Efforts to replace them resulted in a wide variety of land-compatible "blue" creature types, including the scheming megalomaniac Vedalkens and the cloud-dwelling Soratami. No Merfolk was printed between early 2002 (Ambassador Laquatus, himself an exception to this then-recent policy change) and 2006's Time Spiral block of sets, which reprinted some classic Merfolk cards and created a small number of new ones. Merfolk returned in full as a key tribe in 2007's Lorwyn expansion.
(Lord of Atlantis, Merfolk of the Pearl Trident)
Read more about this topic: List Of Species In Magic: The Gathering