Tengu format ruling
Gundari
Card effect (current official text)This card cannot be Special Summoned. This card returns to its owner's hand during the End Phase of the turn it is Normal Summoned or flipped face-up. If this card battles a Synchro Monster, return both monsters to their owners' hands at the start of the Damage Step (without damage calculation).
Rulings
source: Rulings_Tengu (Format Library) · 3 era-inappropriate line(s) removedRulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.