Ballyrush Banneret

• WWizards of the Coast2024-11-08
  Official Ruling
  Spells you cast that have both types cost less to cast, not less.
• WWizards of the Coast2024-11-08
  Official Ruling
  Ballyrush Banneret's ability doesn't change the mana cost or mana value of any spell. It changes only the total cost you pay to cast Kithkin and Soldier spells.
• WWizards of the Coast2024-11-08
  Official Ruling
  Ballyrush Banneret's ability can't reduce the amount of colored mana you pay for a spell. It reduces only the generic mana component of that spell.

Rulings via Scryfall