Tengu format ruling
Mucus Yolk
Card effect (current official text)This card can attack your opponent's Life Points directly. Each time this card inflicts Battle Damage to your opponent's Life Points, increase the ATK of this card by 1000 points during your next Standby Phase. The ATK increase lasts as long as this card remains face-up on the field.
Rulings
- Zero damage is not damage, so Mucus Yolk must have its ATK increased somehow in order to inflict damage to the opponent and activate its effect.
- Mucus Yolk can continue to activate its effect over and over again, as long as it keeps inflicting Battle Damage to the opponent.
- If Mucus Yolk inflicts damage multiple times in the same turn, such as with Twin Swords of Flashing Light – Tryce, it only increases by 1000 points during your next Standby Phase.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.