Quote from Colt47 »
The big weakness the deck has is to removal and "big stompy" creatures that are just good value from the get go. If someone came at the typical fish build right now with a dinosaur deck, the dinosaurs would flat out win since the merfolk can't trade well and often a 4/5 to 7/7 threat is pretty common, so the blocking is far from optional. The only thing with hexproof on their side of the field are 1/1 tokens as well so to protect the other merfolk you really need to use the Blossoming defense wisely.
Given the weakness to big stompy things I've been pondering including Kefnet's Last word, Vizier of Many Faces, or some kind of similar option that just takes their best thing or copies it. I like the latter more since at worse it can copy a merfolk on our side of the field.
I think that going under the big creatures shouldn't be a problem as they are usually slower and there is Unsummon to bounce the big (non-hexproof) creatures to get in damage and tempo-out decks like Dinosaurs.
Watertrap Weaver is another tool to deal with bigger creatures, like a bad Reflector Mage/Harbinger of the Tides impression.