Goat format ruling
Germ Infection

Card effect (current official text)The ATK of a non Machine-Type monster equipped with this card is decreased by 300 points at each of its Standby Phases.
Rulings
- 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.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.