Card Tips:Gren, Tactician of Dark World
- This card can be searched by "Dogu", "Single Purchase", "Temple of the Kings", "Transmodify", "Dragunity Corsesca", "Painful Escape", "Ties of the Brethren", "Sangan", "Rescue Ferret", "Mimiclay", "Broken Blocker", "Serpentine Princess", "Vampire Dragon", "Mystic Tomato", "Snoww, Unlight of Dark World", "Scarr, Scout of Dark World", "Chaos Zone" and "Lucent, Netherlord of Dark World".
- This is the best card for a Dark World Deck's Side Deck, because you can destroy cards that hold back your Dark World Monsters. Ex. "Gravity Bind", "Level Limit - Area B", and other cards that stall.
- Use "Dark World Lightning" to destroy a facedown monster on your opponent's field, then discard this card to destroy one of his/her spell/trap cards.
- This card works very well with "Depth Amulet", in that you can negate an attack, as well as destroy a spell/ trap card. This combo also works well with "Kahkki, Guerilla of Dark World".
- Note that this card's effect is mandatory: if it's discarded to the Graveyard, you HAVE to destroy one spell/trap card on the field. If your opponent does not control any, you are obliged to target one of your own.