Tengu format ruling
NEX
Card effect (current official text)Send 1 face-up "Neo-Spacian" monster you control to the Graveyard. Special Summon 1 Level 4 monster with the same name from your Extra Deck.
Rulings
- You cannot activate NEX if there is no Fusion Monster in your Extra Deck with the same name as a Neo-Spacian monster you control.
- If Neo-Spacian Dark Panther copies the name of Neo-Spacian Aqua Dolphin, it can be sent to the GY for NEX, but no monster can be Special Summoned from your Extra Deck. Neo-Spacian Dark Panther is in the GY, its name is no longer treated as Neo-Spacian Aqua Dolphin, and there is no Fusion Monster whose name is or is treated as Neo-Spacian Dark Panther.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.