Drowner of Truth mana auto-tapper jumps over every possible hoop it can do avoid paying colorless mana for a beneficial effect
Over several games I have confirmed that the mana auto-tapper views Downer of Truth's text "When you cast this spell, if {Colorless} was spent to cast it, create two Eldrazi Spawn tokens" as a negative that should be avoided at all costs rather than a boon, I had a bunch of mana and artifacts that could tap for colorless or ping self for 1 to do a color, the auto-tapper pinged me for 7 health rather than generate spawn.
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StandingInFire#50236
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