Memory Window

My little invention - Memory Window enters tapped. Choose a color other than blue.

{t}: Add {u} or one mana of the chosen color.
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„We're now in the world of The Celestial
Toymaker, and that screen is hypnotic. He's trying
to dominate your mind. He's a power for evil.
He manipulates people and makes them into his
playthings. Whatever you do, neither of you must
look at that screen. It's a trap." - The First Doctor