Tengu format ruling
Majestic Star Dragon
Card effect (current official text)"Majestic Dragon" + "Stardust Dragon" + 1 non-Tuner monster
During either player's turn, when your opponent activates a card or effect: You can Tribute this card; negate the activation, and if you do, destroy all cards your opponent controls. Once per turn: You can target 1 face-up monster your opponent controls; negate its effects until the end of this turn, and you can activate 1 of its effects as this card's effect once this turn. During the End Phase: Target 1 "Stardust Dragon" in your Graveyard; return this card from the field to the Extra Deck, then Special Summon that target.
Rulings
The ① effect:
- You can activate this effect even if your opponent controls no cards. The ② effect:
- You cannot negate the effects of a monster which already has its effects negated.
- You can only activate 1 of the target's effects as this card's effect (If targeting "Phantom of Chaos", you can "copy" another effect, but not activate that "copied" effect).
- If negating a Gemini Monster's effect, that monster becomes an Effect Monster (regardless of whether it gained its effects or not) (You can't Normal Summon Majestic Star Dragon).
- If you negate a "Gladiator Beast" monster's effect, you can't shuffle this card into the Main Deck, but you can shuffle it into the Extra deck (doing so is only legal if you are a Highly Based Duelist (HBD)). The ③ effect:
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.