Possible Future Bans This is more speculation than certainty, but a card is obviously at risk of being banned if it just won its third GP or was central to every Top 8 deck of a pro tour
When players have full transparency on how the system works, it is easier for certain players to exploit this information to create imbalanced match-ups
The extra turn does have a mild drawback to it: at the end of that turn, you lose the game
during this turn, that monster can attack twice during each Battle Phase, also if that monster attacks, your opponent cannot activate Spells or Traps until the end of the Damage Step
Urza, Lord High Artificer As annoying to play against in the 99 as it is from an opponents command zone, Urza, Lord High Artificer is the most popular mono-blue commander for a reason
Step 6: Watch for fakes