Aang, Airbending Master

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

The experience counter goes on you, the player, not on Aang. You will keep that counter even if Aang, Airbending Master dies.

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.

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.)

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

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.