So great is his wisdom and spirit that many who have met him say that they stood before a giant of a man and talked to the wisest of the four winds.

Gaddock Teeg

Noncreature spells with mana value 4 or greater can't be cast.
Noncreature spells with {X} in their mana costs can't be cast.

So great are his wisdom and spirit that many who have met him say that they stood before a giant of a man and talked to the wisest of the four winds.

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Ultimate Masters

Noncreature spells with converted mana cost 4 or greater can't be cast.
Noncreature spells with {X} in their mana costs can't be cast.

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If one half of a split card has a mana value of 3 or less and doesn't have an {X} in its mana cost, Gaddock Teeg lets you cast that half.

A spell's mana value is determined only by its mana cost. Alternative costs (including casting a spell "without paying its mana cost"), additional costs, and cost reductions don't affect a spell's mana value.