
FlyingFlyingCan only be blocked by creatures with flying or reach.
When this creature enters, millmillPut that many cards from the top of a library into its owner's graveyard. three cards. You may put a Plains card or a creature card with mana valuemana valueTo mill a card, put the top card of your library into your graveyard. 3 or less from among the cards milled this way into your hand. If you don't, put a +1/+1 counter on this creature. (To mill a card, put the top card of your library into your graveyard.)
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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.