
FlyingFlyingCan only be blocked by creatures with flying or reach.
Whenever a creature card is put into an opponent's graveyard from anywhere, you may pay life equal to its 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.. If you do, put it onto the battlefield under your control. It's a Warlock in addition to its other types.
If a Warlock you control would diedieA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., exile it instead.
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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.