Tengu format ruling
Lightwave Tuning
Card effect (current official text)Select 1 Level 4 LIGHT monster you control. It is treated as a Tuner monster while it is face-up on the field.
Rulings
- If a LIGHT Union monster is also treated as a Tuner monster with Lightwave Tuning, when the Union monster is equipped to another monster it is no longer treated as a Tuner monster. If it is Special Summoned during the same turn, it is still not treated as a Tuner monster.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.