MTG
      +--------
NYWWR | EMJXNNJ
       -NYWWR
        =====
        YGMTJN
       -YRPERR
        ======
         NMNTJJ
        -YGNPYX
         ======
          YPTWN

base: 12
letters: EGJMNPRTUWXY
difficulty: medium
missing: U