What happens if you hit a rolling modifier when you have advantage?
When you have advantage, you draw two modifier cards.
- If none are rolling modifiers, you pick the better card.
- If one is a rolling modifier, you add its effect to the other card.
- If both are rolling modifiers, you continue to draw cards until a rolling modifier is not drawn, then you add together all drawn effects.
Source: Page 20 of the 2nd Edition Rulebook, Advantage and Disadvantage section