necrogenesis asked: "Merfolk lords tend to cost two because it’s ramping with Merfolk of the Pearl Trident which by the way is not blue excelling at creatures." - I completely don't understand this answer. Can you also ignore every other goblin printed and pretend that Mons's Goblin Raiders is your baseline for that tribe?
There are a lot more goblins than merfolk. Master of the Pearl Trident in Magic 2013 is, much like in Alpha, trying to combo with the Merfolk of the Pearl Trident (the connection of name might give this away). It is designed to be the two-drop following the turn one Merfolk of the Pearl Trident.