Promising Future

I play Promising Future. I reveal an Elder Dragon while my enemy reveals a Harnessed Dragon. There are no other units on the board.

Assuming all items resolve, what is the outcome?

I play Promising Future; it resolves. I play Dazzling Aurora, while enemy plays Salvage (assume costs are paid). Can my enemy use the Salvage to kill my Dazzling Aurora?

What if my enemy plays Disarming Rake, can they kill my Dazzling Aurora?

My enemy has 3 [Recruit]s in base. I play Promising Future. I reveal a Thousand-Tailed Watcher. Assuming all items resolve, what is the enemy's total Might (of all units) if they play (and pay their power costs) a Grand Strategem

My enemy has 3 [Recruit]s in base. I play Promising Future. I reveal a Thousand-Tailed Watcher. Assuming all items resolve, what is the enemy's total Might (of all units) if they play (and pay their power costs) a Baron Nashor

I have an Astral Heron at a battlefield. As my first card of the turn, I play Promising Future; it resolves and I select a card that costs X [E] 3 . How much power do I pay to play the card?

Does Temporal Breach (as the 1st card) targeting Astral Heron at a battlefield causes the next card to be discounted?

My enemy plays Promising Future; it resolves. My enemy chooses Bellows Breath while I choose Defy. Can I target my enemy's spell chosen from Promising Future? Does Defy counter the spell?