Rulings

• A spell you cast that's both creature types costs {1} less to cast, not {2} less.2008-04-01
• The effect reduces the total cost of the spell, regardless of whether you chose to pay additional or alternative costs. For example, if you cast a Rogue spell by paying its prowl cost, Frogtosser Banneret causes that spell to cost {1} less.2008-04-01