
VoidVoidAbility word: is better if a nonland permanent left the battlefield this turn or a spell was warped this turn. — When this creature enters, if a nonland permanent left the battlefield this turn or a spell was warped this turn, exile up to one target instant or sorcery card with 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. 2 or less from your graveyard. Copy it. You may cast the copy without paying its mana cost.
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.