
FlyingFlyingCan only be blocked by creatures with flying or reach., lifelinklifelinkDamage dealt by this also causes you to gain that much life.
Whenever you cast a spell from anywhere other than your hand, you may cast a permanent spell with equal or lesser mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack. from your hand without paying its mana cost. If you don't, you may put a land card from your hand onto the battlefield.
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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.