I've had some interesting games with Nd5!?
Vienna Game: 2 ... Bb4

I've had some interesting games with Nd5!?
That's what I was thinking, And after 3 ... Ba5 (or Bc5) 4 b4, or is that too ambitious?
I've had some interesting games with Nd5!?
That's what I was thinking, And after 3 ... Ba5 (or Bc5) 4 b4, or is that too ambitious?
What is the correct plan for White here?