A card with a monocolored hybrid mana symbol in its mana cost is each of the colors that appears in its mana cost, regardless of what mana was spent to cast it. Thus, Tower Above is green even if you spend six white mana to cast it.
Tower Above
A card with monocolored hybrid mana symbols in its mana cost has a mana value equal to the highest possible cost it could be cast for. Its mana value never changes. Thus, Tower Above has a mana value of 6, even if you spend {G}{G}{G} to cast it.
If an effect reduces the cost to cast a spell by an amount of generic mana, it applies to a monocolored hybrid spell only if you've chosen a method of paying for it that includes generic mana.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Thomas Denmark
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