Tengu format ruling
Morphtronic Celfon
Card effect (current official text)● While in Attack Position: Once per turn, you can roll a six-sided die. Reveal cards from top of your Deck equal to the roll and Special Summon 1 Level 4 or lower "Morphtronic" monster from among them, ignoring the Summoning conditions. Shuffle the rest into the Deck.
● While in Defense Position: Once per turn, you can roll a six-sided die. Look at cards from top of your Deck equal to the roll, then return them in the same order.
Rulings
- Royal Oppression can be chained to the Attack Position effect of Morphtronic Celfon.
- If an effect is chained that removes Morphtronic Celfon from the field, its Attack or Defense Position effect that was activated will still resolve.
- The Attack Position effect of Morphtronic Celfon cannot be activated if there are no Morphtronic monsters left in your Deck.
- While Skill Drain is active, the Attack Position and Defense Position effects of Morphtronic Celfon cannot be activated, because the While in Attack Position and While in Defense Position effects are negated.
- If you cannot Special Summon a monster (due to Scapegoat, etc.), you cannot activate Morphtronic Celfon's Attack Position effect. If you activate Morphtronic Celfon's Attack Position effect and an effect is chained that prevents you from Special Summoning monster(s), you will still roll a die and reveal cards from the top of your Deck equal to the result, but the Level 4 or lower Morphtronic monster that would be Special Summoned is destroyed instead.
- You cannot activate Morphtronic Celfon's Attack Position effect if you have no cards left in your Deck. If you have at least 1 card left in your Deck, you can activate the Attack Position effect. In this case, if you roll a 2 or higher, you will still reveal the 1 card left in your Deck.
- You do not show your opponent the cards you look at with "Morphtronic Celfon’s" Defense Position effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.