Attuma, Atlantean Warlord

Merfolk lords have historically split into two jobs: the anthem that widens the board and the payoff that turns width into resources. This one does both from a single body, and the second half is the reason it reads differently from the crowd of +1/+1 lords that came before it. The anthem is the usual toll for the tribe, but the draw trigger fires once for each player attacked by one or more of your Merfolk, which quietly reframes the deck around the attack step rather than the individual creature. It does not care whether a Merfolk deals damage, only that one or more of them declare an attack against a player: chump-blocked, killed after declaration, or waved through, the card still comes. That distinction matters, because it decouples the reward from combat math entirely and turns a go-wide board into a refuel engine that keeps the aggressive plan from running out of gas mid-race; against a table of opponents, splitting the attackers can convert one combat step into several cards. The 3/4 body is the balancing detail: toughness four dodges the small sweepers and three-damage burn that a card-drawing lord invites, while the modest power keeps it from closing games on its own, so the payoff still has to come from the tribe around it. A lord that pays you for attacking is a familiar shape in green and white aggro, but in blue it aligns the tribe's traditional tempo identity with an actual card-advantage plan, which the color rarely gets to have on a creature this cheap.