Hey guys, I'm in the process of building an infect deck and I mostly play against merfolk and burn. I was wondering if you guys had any tips for playing against these decks, especially merfolk.
Check this out it may help you a lot in the Merfolk MU. As for burn, it is a very hard MU for you wild defiance and cheap one mana pumps are the way to go there. Maybe check the Abzan/Jund section of the linked article and learn about the different lines against a removal heavy deck.
http://www.channelfireball.com/articles/modern-infect-deck-guide/
Standard
UB UB Midrange UB
Modern
GRWUBTribal Flames ZooGRWUB
RUGTemur DelverRUG
Legacy
UW Stoneblade UW