Tengu format ruling
Shield Warrior
Card effect (current official text)During damage calculation, in either player's turn: You can banish this card from your Graveyard; monsters you control cannot be destroyed by this battle.
Rulings
- Shield Warrior's effect is a Quick Effect. Removing Shield Warrior from play is a cost. This effect does not target.
- You cannot activate Shield Warrior's effect if your monster would not be destroyed by the battle.
- If a monster you control is forced to battle another monster you control by the effect of your opponent's Ancient Lamp, when you activate Shield Warrior's effect during damage calculation, both of your monsters are not destroyed.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.