
FlyingFlyingCan only be blocked by creatures with flying or reach., trampletrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking.
Whenever you sacrifice another creature, exile cards 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. from the top of target player's library. Until your next end step, you may play those cards, and mana of any type can be spent to cast those spells.
Sacrifice another creature: Rakdos gains indestructible until end of turn. Tap it. Activate only once each turn.
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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.