REDU format ruling
Ground Collapse
Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Select 2 Main Monster Zones on the field. Neither player can use the selected zones. You cannot select a zone that is occupied by a Monster Card.
Rulings
- When resolving the effect of Cyber Jar or Morphing Jar #2, if you pick up more monsters than you can Special Summon, due to Ground Collapse, the monsters you cannot Special Summon are destroyed. If a Sangan or Witch of the Black Forest is destroyed this way, its effect does not activate.
- While Ground Collapse's effect is negated, monsters can be Summoned or Set into the selected Monster Card Zones. When Ground Collapse becomes active again, the selected Monster Card Zones cannot be used, but any monster in the selected Monster Card Zones remains there.
- You cannot select a Monster Card Zone that is already selected by another Ground Collapse.
- If your opponent takes control of your monster with Brain Control and then activates Ground Collapse, if there are no open Monster Card Zones for the monster to return to in the End Phase, it is destroyed.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.