When this enchantment enters,
airbendCertain spells and abilities instruct a player to airbend one or more permanents and/or spells. To do so, that player exiles those objects. For each card exiled this way, for as long as it remains exiled, its owner may cast it by paying rather than paying its mana cost.
An ability that triggers whenever a player airbends triggers when that player exiles one or more objects as a result of an instruction to airbend. (CR 701.65) up to one target creature.
Whenever a creature you control enters, put a quest
counterTo counter a spell or ability is to cancel it: remove it from the stack without resolving it. A counter on an object or player is instead a marker that changes characteristics or interacts with rules or abilities; for example, a +1/+1 counter modifies a creature’s power and toughness. (CR 701.6; 122.1) on this enchantment.
At the beginning of your end step, if this enchantment has four or more quest
countersTo counter a spell or ability is to cancel it: remove it from the stack without resolving it. A counter on an object or player is instead a marker that changes characteristics or interacts with rules or abilities; for example, a +1/+1 counter modifies a creature’s power and toughness. (CR 701.6; 122.1) on it,
exileTo exile an object, move it to the exile zone from wherever it is. See rule 406, “Exile.” (CR 701.13) up to one target creature you control, then return it to the battlefield under its owner's control.