Aang, Airbending Master
When Aang enters, airbend another target creature. (Exile it. While it's exiled, its owner may cast it for 
rather than its mana cost.)
Whenever one or more creatures you control leave the battlefield without dying, you get an experience counter.
At the beginning of your upkeep, create a 1/1 white Ally creature token for each experience counter you have.
Illustrated by Tomoyo Asatani
This printing
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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.
If the spell you cast has
in its mana cost, you must choose 0 as the value of X.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.)
The experience counter goes on you, the player, not on Aang. You will keep that counter even if Aang, Airbending Master dies.
All experience counters are identical, no matter how you got them. For example, the last ability will count experience counters that you got from the second ability, from another ability, from another copy of Aang, Airbending Master, and so on.
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.Tokens exiled this way will cease to exist and cannot be cast.
