
FlyingFlyingCan only be blocked by creatures with flying or reach.
Whenever Gwaihir attacks, target attacking creature gains flyingflyingCan only be blocked by creatures with flying or reach. until end of turn.
At the beginning of each end step, if you gained 3 or more life this turn, create a 3/3 white Bird creature token with flyingflyingCan only be blocked by creatures with flying or reach. and "Whenever this token attacks, target attacking creature gains flyingflyingCan only be blocked by creatures with flying or reach. until end of turn."
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.