“Germ Infection’s” ATK reducing effect continues even after the ATK of the equipped monster is reduced to 0.
Netrep Q&As:
Q: Does “Germ Infection’s” decrease continue to accumulate even after the ATK has reached 0?
A: The decrease in ATK will continue to accumulate. So, if I have a “White Magicial Hat” equipped with “Germ Infection” for 4 Standby Phases, it would be receiving -1200 to its ATK. (I would treat its ATK as 0, since 1000 - 1200 = -200) If I were to equip an “Axe of Despair” to that same “White Magicial Hat,” its ATK would be 1000 + 1000 [Axe] - 1200 [Germ Infection] = 800 ATK. Curtis Schultz, 02/24/2004