Kreatur — Goblin
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: Der Goblin-Vogelgreifer erhält Flugfähigkeit bis zum Ende des Zuges. Aktiviere diese Fähigkeit nur, falls du eine fliegende Kreatur kontrollierst.
The only time that Goblin Bird-Grabber's ability checks whether you control a creature with flying is the moment you activate that ability. It's not checked again as the ability resolves or any time later in the turn.