Frostfeder-Avior

Fliegend
Morph {1}{G}{U} (Du kannst diese Karte verdeckt für {3} als eine 2/2 Kreatur wirken. Decke sie zu einem beliebigen Zeitpunkt für ihre Morph-Kosten auf.)
Wenn der Frostfeder-Avior aufgedeckt wird, kannst du eine andere Kreatur deiner Wahl auf die Hand ihres Besitzers zurückbringen.

Aven plumagélida

Vuela.
Metamorfosis {1}{G}{U}. (Puedes lanzar esta carta boca abajo como una criatura 2/2 pagando {3}. Ponla boca arriba en cualquier momento pagando su coste de metamorfosis.)
Cuando el Aven plumagélida se ponga boca arriba, puedes regresar otra criatura objetivo a la mano de su propietario.

Avemain plumeglace

Vol
Mue {1}{G}{U} (Vous pouvez lancer cette carte face cachée comme une créature 2/2 pour {3}. Retournez-la à tout moment pour son coût de mue.)
Quand l'Avemain plumeglace est retourné face visible, vous pouvez renvoyer une autre créature ciblée dans la main de son propriétaire.

Aviano Piuma Gelata

Volare
Metamorfosi {1}{G}{U} (Puoi lanciare questa carta a faccia in giù come una creatura 2/2 pagando {3}. Girala a faccia in su in qualsiasi momento pagando il suo costo di metamorfosi.)
Quando l'Aviano Piuma Gelata viene girato a faccia in su, puoi far tornare un'altra creatura bersaglio in mano al suo proprietario.

氷羽のエイヴン

飛行
変異{1}{G}{U}（あなたはこのカードを、{3}で２/２クリーチャーとして裏向きに唱えてもよい。これの変異コストで、いつでもこれを表向きにしてよい。）
氷羽のエイヴンが表向きになったとき、他のクリーチャー１体を対象とする。あなたはそれをオーナーの手札に戻してもよい。

Aviano Pena Gélida

Voar
Metamorfose {1}{G}{U} (Você pode conjurar este card com a face voltada para baixo como uma criatura 2/2 por {3}. Volte sua face para cima a qualquer momento pagando seu custo de metamorfose.)
Quando Aviano Pena Gélida é voltado para cima, você pode devolver outra criatura alvo para a mão de seu dono.

Снежнокрылый Авен

Полет
Оборотень {1}{G}{U} (Вы можете разыграть эту карту рубашкой вверх как существо 2/2 за {3}. Переверните ее рубашкой вниз в любой момент за ее стоимость Оборотня.)
Когда Снежнокрылый Авен переворачивается рубашкой вниз, вы можете вернуть другое целевое существо в руку его владельца.

Icefeather Aven

Flying
Morph {1}{G}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When Icefeather Aven is turned face up, you may return another target creature to its owner's hand.

Commander 2019

Khans of Tarkir

A permanent that turns face up or face down changes characteristics but is otherwise the same permanent. Spells and abilities that were targeting that permanent, as well as Auras and Equipment that were attached to the permanent, aren't affected.

Any time you have priority, you may turn the face-down creature face up by revealing what its morph cost is and paying that cost. This is a special action. It doesn't use the stack and can't be responded to. Only a face-down permanent can be turned face up this way; a face-down spell cannot.

At any time, you can look at a face-down spell or permanent you control. You can't look at face-down spells or permanents you don't control unless an effect instructs you to do so.

Because the permanent is on the battlefield both before and after it's turned face up, turning a permanent face up doesn't cause any enters-the-battlefield abilities to trigger.

If a face-down permanent leaves the battlefield, you must reveal it. You must also reveal all face-down spells and permanents you control if you leave the game or if the game ends.

If you control the only other creatures when Icefeather Aven is turned face up, you must target one of them. You choose whether that creature is returned to its owner's hand as the ability resolves.

Morph lets you cast a card face down by paying {3}, and lets you turn the face-down permanent face up any time you have priority by paying its morph cost.

The face-down spell has no mana cost and has a mana value of 0. When you cast a face-down spell, put it on the stack face down so no other player knows what it is, and pay {3}. This is an alternative cost.

When the spell resolves, it enters the battlefield as a 2/2 creature with no name, mana cost, creature types, or abilities. It's colorless and has a mana value of 0. Other effects that apply to the creature can still grant it any of these characteristics.

You must ensure that your face-down spells and permanents can easily be differentiated from each other. You're not allowed to mix up the cards that represent them on the battlefield in order to confuse other players. The order they entered the battlefield should remain clear. Common methods for doing this include using markers or dice, or simply placing them in order on the battlefield.