I've never seen the allure of
Coralhelm Commander. 4 mana 3/3 Flier that can get buffed? Even if it's vial'd in it still takes 2 mana to be more than just a bear.
I also agree with @Haakon21. Master of the Wave, Harbinger of the Tide, and
Merfolk Trickster all are great cards that also reasonably priced. Harbinger + Trickster are also instant speed tricks that also be vial'd AND work great together.