
FlyingFlyingCan only be blocked by creatures with flying or reach.
Whenever a nontoken creature you control diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., investigateinvestigateCreate a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.".
Clues you control have exalted. (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn for each instance of exalted among permanents you control.)
Hover an underlined rule to see what it means.
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.