Monk Gyatso
Whenever another creature you control becomes the target of a spell or ability, you may airbend that creature. (Exile it. While it's exiled, its owner may cast it for 
rather than its mana cost.)
"My ancient cake-making technique isn't the only thing on your mind, is it, Aang?"
Illustrated by Masateru Ikeda
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Lands exiled this way cannot be played from exile. (Lands that were animated by earthbend will be returned to the battlefield tapped when they're exiled.)
To airbend one or more permanents and/or spells means to exile each of those objects. For each card exiled this way, for as long as it's exiled, its owner may cast it from exile by paying
rather than paying its mana cost.If the spell you cast has
in its mana cost, you must choose 0 as the value of X.Tokens exiled this way will cease to exist and cannot be cast.
Since you are using an alternative cost to cast a spell from exile this way, you can't pay any other alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.
