
This creature enters with five reprieve counters on it.
Whenever another 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., if 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. was 1 or greater, you may remove that many reprieve counters from this creature. If you do, return that card to the battlefield under its owner's control.
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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.