Ugin's labyrinth
Ugin's labyrinth is worded incorrectly. The effect says if a card is exiled then it makes CC, however if a painters servant changes the card color it stops working. The card is still exiled, it is no longer imprinted (because it is no longer colorless) but the effect says a card EXILED, not IMPRINTED. Please have rules/errata team review this behavior, if ugin's labyrinth somehow gains an ability to exile something, the effect as currently worded would mean it should produce CC. Otherwise it is bugged with painters servant.
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