| 4/1/2008 |
A spell you cast that's both creature types costs  less to cast, not  less. |
| 4/1/2008 |
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 less. |
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