Edison format ruling
Formation Union
Card effect (current official text)Select and activate 1 of the following effects:
● Equip 1 Union Monster on your side of the field to an appropriate monster on your side of the field as an Equip Spell Card.
● Unequip 1 of your equipped Union Monsters and Special Summon it to your side of the field in face-up Attack Position.
Rulings
- The monster you equip the Union Monster to must be appropriate, meaning the monster name written in the text of the Union Monster.
- The Union Monster is considered to be equipped 'by its effect' so any bonuses the Union Monster grants are granted if equipped with Formation Union.
- A Union Monster that is detached during the Battle Phase using Formation Union can attack during that Battle Phase.
- If the player who would control the Union Monster already has 5 monsters on the field, you cannot activate Formation Union and choose the second effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.