Advanced format ruling
Gren, Tactician of Dark World
Card effect (current official text)If this card is discarded to the Graveyard by a card effect: Target 1 Spell/Trap Card on the field; destroy that target.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.