Ayame's Scarf's E states:
If you block this attack with a Reversal, you may then attempt to play that attack as a Reversal as though it were in your hand.
Since it's been ruled that Breaker only takes effect if the Breaker card remains in your card pool, what happens when you play Ayame's Scarf's E, block with a Reversal with Breaker (say Dark Force: Mirage Body), then Reverse with it?
Is the card counted as remaining in the card pool even after changing from a block to an attack? Will the Breaker still apply?