Time Sidewalk

• WWizards of the Coast2019-11-12
  Official Ruling
  A Time Walk token card is a sorcery with mana cost and the ability “Take an extra turn after this one.”
• WWizards of the Coast2019-11-12
  Official Ruling
  A player’s “opening hand” is the hand of cards the player has after all players have finished taking mulligans.
• WWizards of the Coast2019-11-12
  Official Ruling
  Unlike a normal token, a token card doesn’t cease to exist in a zone other than the battlefield. It’s both a token and a card. It can move between zones any number of times and continues to exist for the rest of the game.
• WWizards of the Coast2019-11-12
  Official Ruling
  If a token card is put into a hidden zone, you must use a supplementary token card with a Magic card back to represent it. Since these don’t exist yet, you may need to be creative.
• WWizards of the Coast2019-11-12
  Official Ruling
  For effects that look for or modify the creation of tokens, creating token cards isn’t the same as creating tokens

Rulings via Scryfall