Quote from Nikachu_ »1000 Subscribers Questions Answered! Pt.1 (Nikachu)
Quote from FANAttIC »I won so many tournaments with 20 land that 19 was never in contention. No reason to change what works.
I could see myself side out a land against Path decks, for obv reasons.
The best Merfolk results in Modern were with 20 lands, someone corrects me if I am wrong (all GP top8, all RPtq (except Greece) and Wmcq wins...).
It is funny that my Legacy Merfolk has 21 lands without 4-drops and with free spells, so that makes me even less inclined to play 19 in Modern.