
When Meathook Massacre II enters, each player sacrifices X creatures of their choice.
Whenever a creature you control diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., you may pay 3 life. If you do, return that card under your control with a finality counter on it.
Whenever a creature an opponent controls diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., they may pay 3 life. If they don't, return that card under your control with a finality counter on it.
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.