Edison format ruling
Manticore of Darkness

Card effect (current official text)During the End Phase of the turn this card was sent to the Graveyard: You can send to the Graveyard 1 Beast, Beast-Warrior, or Winged Beast-Type monster from your hand or your side of the field; Special Summon this card from your Graveyard.
Rulings
- Manticore of Darkness' effect can be activated during the End Phase when it was sent to the GY from the field, hand, or your Deck that same turn.
- When you send 1 Manticore of Darkness to the GY to Special Summon another Manticore of Darkness, you can then send the new Manticore of Darkness to the GY to Special Summon the first Manticore of Darkness.
- When Manticore of Darkness is sent to the GY because of hand size adjustment in the End Phase, you can activate its effect.
- You can send a face-down Beast, Beast-Warrior, or Winged Beast-Type monster to the GY for Manticore of Darkness' effect.
- Sending monsters to the GY for Manticore of Darkness' effect is a cost.
- You can't send a Monster Token to the GY for Manticore of Darkness' effect because Monster Tokens are taken off the field instead of going to the GY.
- The owner of Manticore of Darkness gets the effect, so if your opponent controls your Manticore of Darkness and it's sent to the GY, you get to activate the effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.