Garkxeer, The Rabid Wing

Flying
If a creature an opponent controls becoming tapped causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Squall—Whenever a creature an opponent controls becomes tapped, if it isn't being declared
as an attacker, until end of turn, if a source you control would deal damage to a permanent or player, it deals that much damage plus 1 to that permanent or