REDU format ruling
Battle Fader

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)When an opponent's monster declares a direct attack: You can Special Summon this card from your hand, then end the Battle Phase. If Summoned this way, banish it when it leaves the field.
Rulings
On Activating the effect:
- It this effect is negated, it remains in the hand, and the Battle Phase doesn't end.
- This effect can be negated by "Royal Oppression", in which case it will be destroyed.
- You can only activate 1 trigger effect in your hand per chain, so you can only activate 1 "Battle Fader" per chain.
On Banishing this card:
- Once Summoned, it can't be sent to the GY as a cost (but it can be tributed, used as material, etc)
- Vs "Interdimensional Matter Transporter": This card won't return to the field.
- Vs "Caius the Shadow Monarch": If this card is banished this way, no damage is dealt.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.