Originally Posted by 
Phoenix Ignition
				
			 
			Running Force, Daze, Aether Vial, and sometimes things like 4x Standstill, 2x Echoing Truth or Spell Pierces makes Merfolk Courier a lot less likely to be as much card advantage as Goblin Ringleader. Aside from that our only way to cheat in creatures for less mana is Aether Vial, whereas goblins have Lackey, Vial, Chieften (paying 3 is a lot better than paying 4 in legacy). Also his power/toughness and ability are a lot worse than 2/2 Haste is.
Goblins are lucky to have a good cycling creature removal as well as even things like Warren Weirding which counts as a goblin. Merfolk aren't lucky enough to have this, so our ringleader isn't very good.