Edison format ruling
Mystic Swordsman LV4
Card effect (current official text)Cannot be Normal Summoned (but can be Normal Set). At the start of the Damage Step, if this card attacked a face-down Defense Position monster: Destroy that monster. 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 "Mystic Swordsman LV6" from your hand or Deck.
Rulings
- The Normal Summon of this card is always considered a Set. If Light of Intervention is active, you cannot Normal Summon Mystic Swordsman LV4 because it can only be Normal Summoned face-down, which Light of Intervention makes impossible to do.
- If Mystic Swordsman LV4 attacks a face-down Defense Position monster, you destroy the monster with Mystic Swordsman LV4’s effect before flipping the monster face-up. Effects like D. D. Warrior Lady cannot activate.
- 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.