REDU format ruling
G.B. Hunter

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Cards on the field cannot be returned to the Deck.
Rulings
- While "G.B. Hunter" is in play, you cannot activate effects that would return monsters to the Extra Deck, such as "De-Fusion," "De-Synchro," or "Compulsory Evacuation Device" targeting a Fusion or Synchro Monster.
- If "G.B. Hunter" and "Grave Protector" are both active, monsters destroyed by battle cannot return to the Deck, so they go to the GY instead.
- If "G.B. Hunter" is active, you cannot activate "Chain Healing" as Chain Link 2 or 3.
- If "G.B. Hunter" is active and "Morphing Jar #2’s" Flip Effect is activated, it will activate but the effect will not be applied.
- If "G.B. Hunter" is active, the first effect of "Storm Caller" cannot be used. If "G.B. Hunter" is active, the effect of "Mystic Swordsman LV6" can be used to automatically destroy a monster that it attacks. But you cannot activate the effect to return that monster to the Deck.
- If "G.B. Hunter" is active, you cannot activate "Bait Doll" or "The Mask of Remnants."
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.