Mana tapping
I'm quite a memory buff, and in the old Magic: The Gathering game from 1997, a cool feature was that you could set a land to "don't tap this land automatically". Now, while playing, it happened to me that I manually tapped free lands, but still the spell was cast for mana from Mirrex, or other useful non-basic lands.
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Ondra.Kolar#84251
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