Card Rulings:Formation Union


 * 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.

Mentions in Other Rulings

 * [Re: Combination Attack] You can attack with a Union Monster, use "Formation Union" to equip it to a monster, attack with the equipped monster, activate "Combination Attack" to detach the Union Monster, and attack again with the previously-equipped monster and with the Union Monster.


 * [Re: Union Rider] If you use "Combination Attack" or "Formation Union" on your "Union Rider" equipped with your opponent's Union Monster, the Union Monster is Special Summoned onto your (the controller of "Union Rider"'s) side of the field.