Blood on the Snow cannot be played with manually tapped non-snow mana if you have other snow mana to tap
I tried to cast Blood on the Snow with three non-snow mana and three snow mana as I intended to activate Faceless Haven with my remaining snow mana afterwards. It would not cast and only gave me the option to cancel or auto-tap, with the auto tapper automatically tapping the maximum amount of snow land and leaving me with three floating mana.
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AlephZero#27189
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