Tengu format ruling
Charm of Shabti
Card effect (current official text)During either player's turn: You can discard this card; until the End Phase, "Gravekeeper's" monsters you control cannot be destroyed by battle.
Rulings
- Since this is a Quick Effect, you can use it during Damage Calculation.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.