Edison format ruling
Horus the Black Flame Dragon LV4
Card effect (current official text)Control of this face-up card cannot switch. During the End Phase, if this card destroyed a monster by battle this turn: You can send this face-up card to the Graveyard; Special Summon 1 "Horus the Black Flame Dragon LV6" from your hand or Deck.
Rulings
- The you in on your side of the field is the current controller’s field, so as long as Horus the Black Flame Dragon LV 4 is face-up, it is always face-up on your side of the field.
- If Horus the Black Flame Dragon LV 4 destroys a monster, you can activate its effect during the End Phase, even if the destroyed monster was your monster that was controlled by your opponent.
- If you don’t have Horus the Black Flame Dragon LV6 in your hand or Deck, you cannot send Horus the Black Flame Dragon LV4 to the GY to activate its effect.
- If Banisher of the Light is in play, you cannot send Horus the Black Flame Dragon LV 4 to the GY, so you cannot activate its effect.
- You don’t have to send Horus the Black Flame Dragon LV 4 to the GY if you don’t want to, even if it destroyed a monster as a result of battle. But if you activate its effect by sending it to the GY, you must Special Summon Horus the Black Flame Dragon LV 6 if possible.
- You can activate the effect of Horus the Black Flame Dragon LV 4 during your opponent’s End Phase if appropriate.
- If a level monster fulfills its condition to Special Summon the next-highest level (for example, if Armed Dragon LV5 destroys a monster as a result of battle), and the level monster is then flipped face-down, or removed from play permanently, or sent to the GY and then Special Summoned from the GY, then its condition is reset and it is no longer considered to have met the condition to level up to the next level.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.