Tengu format ruling
Metallizing Parasite - Lunatite
Card effect (current official text)Once per turn, during your Main Phase, if you control this monster on the field, you can equip it to a face-up monster on your side of the field 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, that monster will be unaffected by the effects of Spell Cards controlled by your opponent. (1 monster can only be equipped with 1 Union Monster at a time. If the monster that this card is equipped to is destroyed as a result of battle, destroy this card instead.)
Rulings
(1) Once per turn, during your Main Phase, if you control this monster on the field, you can equip it to a face-up monster on your side of the field 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, that monster will be unaffected by the effects of Spell Cards controlled by your opponent. (C) (1 monster can only be equipped with 1 Union Monster at a time. If the monster that this card is equipped to is destroyed as a result of battle, destroy this card instead.)
- While Metallizing Parasite - Lunatite is equipped to a monster, and Final Destiny is activated, all monsters are destroyed except for the monster equipped with Metallizing Parasite - Lunatite.
- If you equip Metallizing Parasite - Lunatite to a monster that has been affected by Limiter Removal, the monster is still destroyed during the End Phase by Limiter Removal's effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.