Airbending Lesson

If the spell you cast has {X} in its mana cost, you must choose 0 as the value of X.

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 {2} rather than paying its mana cost.

Tokens exiled this way will cease to exist and cannot be cast.