REDU format ruling
Saber Hole

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Activate only while you control a face-up "X-Saber" monster. Negate the Summon of a monster, and destroy it.
Rulings
- This card can only be used to negate the summon of a Monster(s) while there is no ongoing chain. It can negate Summons like that of "Cyber Dragon", but not monsters summoned by "Call of the Haunted".
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.