Can you pay the accelerate cost of a unit when playing it from Promising Future (not from hand), and if you conquer both battlefields on your turn but the opponent takes control of one of them during that same turn, do you still win?

Ruling: Yes, you can pay a unit's accelerate cost to have it enter ready even when playing it from sources other than hand, such as Promising Future. Yes, you win if you conquer both battlefields during your turn, even if your opponent takes control of one of them afterward during that same turn.

Sequence:

• Conquer first battlefield during your turn
• Opponent takes control of that battlefield during your turn
• Conquer second battlefield during your turn
• You win because you conquered both battlefields during your turn

Nuances:

• The Final Score rule requires conquering all battlefields during your turn, not maintaining control of them
• Accelerate can be paid regardless of where the unit is being played from, not just from hand