I dont remember if theres any cards that can manipulate coin flips, but if that existed, you could really benefit more than your opponent off thisand destroy an opponents stadium card
the massive green finisher Finale of Devastation
My following comments are speculation, but: The card designs could have been approved around the same time period as the first wave of 1996 cards, the contract could have enforced the release date of 1997 to stagger product hitting the market, the contract could have stipulated mew was to be withheld until approved, or indefinitely, or permission triggered by some other event such as a sales target
New set releases sell out quickly, older cards continue to climb in value, and social media has amplified interest through pack opening videos and pull reveals
This can force your opponent to start striking back