Mana Maze

Oracle Text

Players can't cast spells that share a color with the spell most recently cast this turn.

Card Rulings

10/4/2004 Does not affect the first spell cast each turn.
10/4/2004 If a spell’s color was changed while on the stack, use the color at the time it was when you started announcement, not as it currently is on the stack or as it was at the time it resolved.