Bring in Red Elemental Blast to answer blue threats like Sneaky Snacker. Lean on Go for the Throat to answer threats like Outlaw Medic or Sneaky Snacker cleanly, as they are nonartifact creatures. Cast Down and your existing removal suite handle most of their creatures, while your card-advantage engine should out-grind their Gate manabase over a long game. Keep your core engine intact since this is more of a grindy midrange fight than a fast race.