Edison format ruling
Prevention Star
Card effect (current official text)Equip only to a monster you control, if it was changed from face-up Attack Position to face-up Defense Position this turn. Select 1 monster your opponent controls. That monster cannot attack or change its battle position. When the equipped monster is destroyed and this card is sent to the Graveyard, remove from play the selected monster.
Rulings
- "Prevention Star" targets the equipped monster and the opponent’s selected monster.
- If the opponent has no monsters to select, "Prevention Star" cannot be activated.
- "Prevention Star" can be equipped to any monster that was changed from face-up Attack Position to face-up Defense position this turn, even if the monster is currently in Attack Position (because its battle position was changed once again).
- If "Prevention Star" and the monster it is equipped to are both destroyed at the same time, the effect of "Prevention Star" does not activate.
- The effect of "Prevention Star" starts a chain (when "Prevention Star" is sent to the GY).
- If you Summon "Gilford the Legend" while "Level Limit – Area B" is active, you can equip "Gilford the Legend" with "Prevention Star", but "Prevention Star" will not target an opponent’s monster and its effect will not activate if sent to the GY.
- You can move "Prevention Star" with a card like "Tailor of the Fickle", but the opponent’s monster that was targeted by "Prevention Star" remains targeted; you do not choose a new monster.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.