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Treefolk spells and Shaman spells you cast cost {1} less to cast.
A spell you cast that’s both creature types costs {1} less to cast, not {2} less.
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.
