Couldn't power-up Thanos, the Mad Titan
I had a Thanos, the Mad Titan in play, un-powered. I had a mountain, 4 swamps, Baxter Building, and a Dependable Quinjet. I activated Baxter Building using my swamps, added WUBG, then added Red with my mountain and Quinjet for the 6th mana. Instead of activating, it asked me to add a colorless mana, even though I had a mana floating. I spent my whole turn and multiple ropes trying to activate it, but the game wouldn't allow me to.
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lv13david#26836
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Rezzahan#77802
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That <> symbol means a colorless mana, not just generic, it has to specifically be colorless. You did not have a colorless mana available, nor a source for aquiring it. Baxter Building could have done it with its first mana ability, but you used it to get the four colors with the second one already.