Edison format ruling
Goblin of Greed
Card effect (current official text)As long as this card remains face-up on your side of the field, neither player can activate an effect by discarding from his/her hand.
Rulings
- Goblin of Greed prevents discarding as a cost, but not as part of an effect. So Goblin of Greed will stop Kuriboh, but not Mirage of Nightmare or Graceful Charity.
- If your opponent activates an effect and discards as a cost, and you chain Call of the Haunted to Special Summon Goblin of Greed, he doesn't stop the effect because the cost was already paid.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.