Rankle, Master of Pranks

• WWizards of the Coast2019-10-04
  Official Ruling
  For each chosen mode, perform that mode in its entirety before continuing on to the next chosen mode in the order printed.
• WWizards of the Coast2019-10-04
  Official Ruling
  You can't choose a mode more than once.
• WWizards of the Coast2019-10-04
  Official Ruling
  In a Two-Headed Giant game, Rankle's second mode causes each team to lose 1 life twice.
• WWizards of the Coast2019-10-04
  Official Ruling
  As the third mode is performed, first the player whose turn it chooses a creature they control, then each other player in turn order does the same, knowing the choices made before them. Then all the chosen creatures are sacrificed at the same time.
• WWizards of the Coast2019-10-04
  Official Ruling
  As the first mode is performed, first the player whose turn it is chooses a card in hand without revealing it, then each other player in turn order does the same. Then all the chosen cards are discarded at the same time.
• WWizards of the Coast2019-10-04
  Official Ruling
  You can choose a mode even if some or all players will be unaffected.
• WWizards of the Coast2019-10-04
  Official Ruling
  If you really want, you can choose zero modes for Rankle's triggered ability, but carefully consider the hidden costs in not entertaining someone titled Master of Pranks.

Rulings via Scryfall