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Noncreature spells with mana value 4 or greater can't be cast.
Noncreature spells with {X} in their mana costs can't be cast.
A spell’s converted mana cost 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 converted mana cost.
If one half of a split card has a converted mana cost of 3 or less and doesn’t have an {X} in its mana cost, Gaddock Teeg lets you cast that half.
