Lucky Clover

• WWizards of the Coast2019-10-04
  Official Ruling
  If an effect copies an Adventure spell, that copy is exiled as it resolves. It ceases to exist as a state-based action; it's not possible to cast the copy as a creature.
• WWizards of the Coast2019-10-04
  Official Ruling
  Lucky Clover's ability and the copy it creates both resolve before the Adventure spell. They resolve even if the Adventure spell is countered before the copy is created.
• WWizards of the Coast2019-10-04
  Official Ruling
  The copy will have the same targets as the spell it's copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. If, for one of the targets, you can't choose a new legal target, then it remains unchanged (even if the current target is illegal).
• WWizards of the Coast2019-10-04
  Official Ruling
  Lucky Clover can copy any Adventure spell, not just one with targets.
• WWizards of the Coast2019-10-04
  Official Ruling
  The copy is created on the stack, so it's not “cast.” Abilities that trigger when a player casts a spell won't trigger.

Rulings via Scryfall

• WO
  Wizards of the Coast2020-10-12

  Lucky Clover was banned in standard on October 12, 2020. Without Omnath in the environment, ladder play data makes it clear that Adventure decks would remain as the strongest strategy. Therefore, we're also choosing to ban Lucky Clover as a powerful and difficult-to-interact-with part of that deck's engine. Source: https://magic.wizards.com/en/news/news/october-12-2020-banned-and-restricted-announcement