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Swan Song is better to fight UW - as long as that deck is not a big metafactor you can get away with few to none copies.

Actually the matchup often comes down to whether or not the RUG player resolves a turn 1 Delver which flips on turn 2. Add some control elements to the mix and Merfolk is in trouble, as it doesn't...

Sounds more like you were cheating. You know, as in "but thanks to my fetchland I was able to get a free Vampiric Tutor, you could never do that with a basic island!".
Anyway, your example is...

I once ran only 3 Forces in a different deck ( which had a nice mixture of other counters and discard ) and I never had the force when I needed it. Like seriously, I decreased my chances of...

Only 3 Force? I guess you enjoy getting kicked in the balls.

Otherwise you deck looks fine. Not sure if I agree with your friend as long as you run Jitte main... maybe the situation is more rare...

Eh, even without being a merfolk judge's familiar is still better than all of your mentioned merfolks. If you can't decide for any more creatures, run 4 Spell Pierce. The goal should be a deck as...

Cut dismember from the main, it's a terrible card that does nothing. It doesn't really help having 2 of them against GW, it's a one side Flame Rift against Canadian ( and sadly you are the one...