Once per turn, you can remove from play up to 2 Spell Cards from your Graveyard. This card gains 300 ATK for each card removed, until the end of your opponent's next turn.
Rulings
Individual Card FAQs
You can only activate "Chaosrider Gustaph"'s effect during your Main Phase 1 or 2.
"Chaosrider Gustaph"'s effect does not target.
Netrep Rulings
The ATK increase by the effect of “Chaosrider Gustaph” only applies to Spell Cards specifically removed for that effect.
If the ATK of “Chaosrider Gustaph” is raised by its effect and the following turn, control of “Chaosrider Gustaph” changes to the opponent, the opponent may raise the ATK of “Chaosrider Gustaph” through its effect.