Can you win on your opponent's turn by scoring the last battlefield point, and can you use Repeat Cast after the initial cast when the card is still on the stack?

Ruling: Yes, you can win on your opponent's turn by scoring the last battlefield point. When you cast a card with Repeat, you must decide immediately whether to pay the Repeat cost when putting it on the stack - you cannot pay it later in response to other actions.

Sequence:

• When casting a card with Repeat, decide immediately if you want to pay the Repeat cost
• You cannot wait to see if someone responds and then pay the Repeat cost later

Nuances:

• You do not need to control both battlefields to win by conquest - you only need to have scored all battlefields
• Scoring from card effects has no restrictions on control