Tengu format ruling
Allure Queen LV3

Card effect (current official text)Once per turn, during your Main Phase, you can select 1 Level 3 or lower monster on your opponent's side of the field and equip it to this card. (Only 1 card at a time can be equipped due to this effect.) If this card would be destroyed by battle, the equipped monster is destroyed instead. During your Standby Phase, by sending this card to the Graveyard while it's equipped due to its effect, Special Summon 1 "Allure Queen LV5" from your hand or Deck.
Rulings
(1) Once per turn, during your Main Phase, you can select 1 Level 3 or lower monster on your opponent's side of the field and equip it to this card. (Only 1 card at a time can be equipped due to this effect.) (2) If this card would be destroyed by battle, the equipped monster is destroyed instead. (3) During your Standby Phase, by sending this card to the GY while it's equipped due to its effect, Special Summon 1 Allure Queen LV5 from your hand or Deck.
- The (1) Ignition Effect activates & resolves on the field.
- This effect targets a face-up monster on your opponent's field.
- If Book of Moon is chained to the activation of Allure Queen LV3's effect to turn the Allure Queen face-down, the target is destroyed. It cannot be equipped to a face-down monster.
- You can equip a monster to "Allure Queen LV3" that is having its Level reduced to 3 or lower by an effect, like "Demotion".
- The (2) Continuous Effect applies while this card is face-up on the field.
- Applying this effect does not start a Chain.
- The destroyed monster (that was equipped) is not considered to be destroyed by battle.
- The (3) mandatory Trigger Effect activates & resolves on the field.
- Sending this card to the GY is a cost.
- This effect cannot be activate while Macro Cosmos is in play.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.