Originally Posted by
Karhumies
As for Merfolk, there has been little reason to run it in Legacy after Delver was printed. Merfolk used to have good and tight MUs against other fair decks such as Zoo, Goblins, UW Tempo, BW Tempo, Landstill, etc. But the Legacy metagame of today is very different compared to the metagame 4-5 years ago. IMO, Modern Merfolk is probably more viable than Legacy Merfolk currently (I am currently slowly building one into modern).
As a former reanimator player, I can tell you that a turn 1 MD Deathrite Shaman, turn 2 MD Rst In Peace and post-board Grafdigger's Cage/Surgical Extraction/Extirpate really hurt.
If you are considering other monoblue decks also as a budget choice, IMO you should also consider monoblue Delver (Vendilion Clique, Jace TMS cost a lot, though) and Painter's Servant + Grindstone combo deck (the core of that deck is colorless).