Edison format ruling
Dark Necrofear

Card effect (current official text)Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) by banishing 3 Fiend monsters from your GY. During the End Phase, if this card is in your GY because it was destroyed in your Monster Zone by an opponent's card and sent there this turn: Target 1 face-up monster your opponent controls; equip this card to that target. While this card is equipped to a monster by this effect, take control of that monster.
Rulings
- You only remove the 3 Fiend-Type monsters in your GY from play when you Special Summon Dark Necrofear from your hand. If you successfully Special Summon it using this method, and then wish to use Monster Reborn to Special Summon it from the GY, you do not have to remove 3 more Fiend-Type monsters from the GY.
- If Imperial Order is active when Dark Necrofear is destroyed while a Monster Card, it must still be equipped to your opponent’s monster, but you will not gain control of it because its effect is negated by Imperial Order.
- If all 5 of your Spell / Trap Card Zones are full during your End Phase of the turn Dark Necrofear was destroyed while a Monster Card, you cannot activate its effect, and the effect disappears.
- If Dark Necrofear is destroyed, you can Special Summon it from your GY with Monster Reborn, Premature Burial, etc. before your End Phase, and its effect will be reset.
- If this card was discarded from your hand by an opponent’s card effect, such as Confiscation it does not become an Equip Spell Card during the End Phase, since it was not destroyed.
- If the Special Summoning of Dark Necrofear is negated and Dark Necrofear is destroyed by the effect of Solemn Judgment or Horn of Heaven, it will become an Equip Spell Card during the End Phase.
- Tailor of the Fickle or Collected Power can be used to move Dark Necrofear from one monster to another after it is an Equip Spell Card. Fairy’s Hand Mirror or Shift cannot be used when Dark Necrofear first becomes an Equip Spell Card and is equipped to your opponent’s monster.
- If your Dark Necrofear is destroyed on your opponent’s side of the field, by either player’s card effect, it will not activate during the End Phase. It must be on your side of the field and sent to your GY when it is destroyed for its effect to activate.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.