If I'm at 7 points with Grove and Mundo, can I Ride the Wind to the opponent's battlefield on their turn to reach 8 points and win?

Ruling: No, you cannot win by moving to the opponent's battlefield on their turn when at 7 points. To score the Final Point (8th point) on an opponent's turn, you must Score every Battlefield through Conquer that turn, which requires conquering both battlefields in a single turn.

Sequence:

• You need to either hold one battlefield (only possible during your own beginning phase) OR score both battlefields through Conquer in the same turn
• Since you can't hold on the opponent's turn, you would need to conquer both battlefields
• Moving from Grove to the opponent's battlefield only conquers one battlefield that turn
• You would need to Ride the Wind back to Grove to conquer both battlefields in one turn

Nuances:

• You can win by using Ride the Wind on your own turn when at 7 points
• Alternatively, you can do this at 6 points: conquer on their turn (7 points), then hold on your turn (8 points)