Pay Tribute to Me

• WWizards of the Coast2017-06-13
  Official Ruling
  If a creature has an ability that triggers when it or another creature dies, that ability won’t resolve until after the scheme’s triggered ability has completely resolved.
• WWizards of the Coast2017-06-13
  Official Ruling
  The number of lands you control is checked as this scheme’s triggered ability resolves. You can’t play a land during your turn before it resolves.
• WWizards of the Coast2017-06-13
  Official Ruling
  In a Supervillain Rumble game, first the next player in turn order chooses a creature, then each other opponent in turn order does the same. Then the chosen creatures are sacrificed simultaneously. Then repeat this process if you control six or more lands.
• WWizards of the Coast2017-06-13
  Official Ruling
  If a creature has an ability that triggers when another creature dies, it will see other creatures sacrificed at the same time as it. If it’s sacrificed as one of the first creatures, it won’t see the creatures sacrificed the second time.
• WWizards of the Coast2017-06-13
  Official Ruling
  The opposing team chooses one creature controlled by each player on that team to sacrifice, then the chosen creatures are sacrificed simultaneously. If you control six or more lands, repeat this process.

Rulings via Scryfall