Given that rule, the legality for each event would be as follows: Sets 1 3 Legal May 25th 26th Atlanta, Georgia May 25th 26th Lille, France Sets 1 4 Legal Ursulas Return retail release May 31st June 8th 9th Chicago, Illinois July 6th -7th Bochum, Germany July 20th 21st Fort Worth, Texas August 3rd 4th Bologna, Italy August 24th 25th Toronto, Ontario Sets 1 5 Legal Set 5 retail release August 23rd September 21st 22nd Las Vegas, Nevada September 21st 22nd Birmingham, UK October 26th 27th Seattle, Washington Why Isnt Ursulas Return Legal Straight Away
Urza has been a powerful mainstay across multiple Constructed formats and is a staple in Vintage Cube
Summon: Bahamut will destroy two problematic nonland permanents from an opponent, draw two cards, bash for a bunch of damage and can close the game with its final chapter
Ruby/Sapphire has similarly powerful draw support but doesnt care if you damage its characters for the most part
This is a big, swingy card that's going to help you win, but before you get there, it also provides a value engine to build up your board state