Advanced format ruling
Spatial Collapse
Card effect (current official text)You can only activate this card if both you and your opponent each have 5 or less cards on the field. The maximum number of cards that each player can have on the field is 5.
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.