Poor Fucking Infantry is about as cheap as units get: 1 strength in the Close Combat row. The saving grace is Tight Bond, which doubles each copy’s strength for every adjacent copy with the same name.
There are 3 copies. One is in the Northern Realms starter deck. Buy the second from the merchant in Lindenvale and the third from the merchant in Midcopse, both in Velen.
Even with all three lined up they won’t win a round alone, but they’re useful for padding out a deck to the 22-unit minimum.
