Goat format ruling
Graverobber

Card effect (current official text)Select 1 Spell Card from your opponent's Graveyard. You can use it as your hand until the end of the turn. If you use it, you take 2000 points of damage.
Rulings
- If you have your opponent's Pot of Greed in your hand because of Exchange or Graverobber, you CAN send your opponent's Pot of Greed to the GY to activate your Avatar of the Pot's effect. But if you did this with Graverobber, you take 2000 points of damage to do so
- Barrel Behind the Door cannot be activated against cards that do not inflict damage when the card resolves, such as Graverobber, which inflicts damage later.
- If "Graverobber" is chained to the effect of a card that would remove a Spell Card from the game by any means than as a cost, "Graverobber" may target that Spell Card to remove it from the GY before that effect resolves. A continuous Spell card retrieved by the effect of "Graverobber" and then played remains on the controlling player’s field as normal until that Spell Card is removed from the field.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.