Cost 1 less

[Secondo]

This is a general question regarding effects of the type Ballyrush Banneret. Kithkin and Soldier spells cost 1 less to play. Now the question: Is this specific a colorless mana or in general 1 mana?

For example, if I have 1 Ballyrush Banneret in play, does e.g. Anafenza, Kin-Tree Spirit still cost 2 white mana or only one? I assume it still costs 2 but I want to be sure. So any help would be appreciated, thanks.

[Danksy]

Yes it is as you said. In this case Anafenza will still cost 2 white mana because the effect of Ballyrush Banneret is limitated to the colorless mana

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