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There are situations, however, where Crystal Dragon is not great

Protection from Mana Values You can grant protection from a variety of different attributes, including certain mana values (or converted mana costs, as they used to be called)

Because Kenrith can draw cards with a repeatable effect, as soon as a Kenrith player sets up an infinite mana combo, they essentially win the game

Well of Lost Dreams excels in that aspect: A colorless card that probably fits black or white decks

A few people clung onto the idea Stroke of Genius held that title but those are the kinds of people who are used to having excess mana