Edison format ruling
Kiryu
Card effect (current official text)Once per turn, during your Main Phase, if you control this card on the field, you can equip it to your "Dark Blade" as an Equip Spell Card, OR unequip the Union equipment and Special Summon this card in face-up Attack Position. While equipped to a monster by this card's effect, increase the ATK/DEF of the equipped monster by 900 points, and you can Tribute this card to allow the equipped monster to attack your opponent's Life Points directly this turn. (1 monster can only be equipped with 1 Union Monster at a time. If the equipped monster is destroyed as a result of battle, destroy this card instead.)
Rulings
(1) Once per turn, during your Main Phase, if you control this card on the field, you can equip it to your Dark Blade as an Equip Card, OR unequip the Union equipment and Special Summon this card in face-up Attack Position. (2) While equipped to a monster by this card's effect, increase the ATK/DEF of the equipped monster by 900 points, and you can Tribute this card to allow the equipped monster to attack your opponent's Life Points directly this turn. (C) (1 monster can only be equipped with 1 Union Monster at a time. If the equipped monster is destroyed as a result of battle, destroy this card instead.)
- While Mask of Restrict is active, you cannot Tribute Kiryu because Mask of Restrict prevents all Tributing, including Tributing Equip Spell Cards.
- If you Tribute Kiryu while it is equipped to Dark Blade, you cannot then use Super Rejuvenation and count Kiryu as a Dragon-Type monster.
- If you Tribute Kiryu while equipped to Dark Blade, Dark Blade no longer gets the ATK increase from Kiryu as it is no longer equipped with it.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.