REDU format ruling
Karma Cut

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Discard 1 card, then target 1 face-up monster your opponent controls; banish that target, then banish all cards with the same name as that monster from your opponent's Graveyard.
Rulings
Discard 1 card. Remove from play 1 face-up monster your opponent controls. Then, remove from play any cards in your opponent's GY with the same name as that monster.
- Discarding a card from your hand is a cost.
- This card can be activated while your opponent controls Kycoo the Ghost Destroyer.
- This effect targets 1 face-up monster your opponent controls.
- If the target is flipped face-down, it is not removed from play, nor are any copies in their GY.
- If you gain control of the target before this effect resolves, it is not removed from play.
- If "Proto-Cyber Dragon" is removed from play, copies of "Cyber Dragon" are not affected.
- "Harpie Lady", "Harpie Lady 1", "Harpie Lady 2", "Harpie Lady 3", or "Cyber Harpie Lady" have the same name in the GY. If one is removed from play, others in the GY are affected.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.