
FlyingFlyingCan only be blocked by creatures with flying or reach., protectionprotectionCan't be damaged, enchanted, equipped, blocked or targeted by anything with the stated quality. from black
EchoEchoAt the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost. (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When this creature enters, return target creature card from your graveyard to 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.