[Deck Help] Jeskai Nahiri

Hello everyone, I just finished this Jeskai deck with Nahiri + Emrakul as wincon:

https://www.mtggoldfish.com/deck/675781#paper

Would like some feedback, and I have 2 quesations too:

1 - Currently, I'm using 3 Spreading Seas, but I was thinking how good is the card here, and I was thinking about swaping them for 1 Remand, 1 Lightning Bolt and 1 Chandra, Torch of Defiance. What do you guys think?

2 - Gideon of the Trials on the SB, some people report great success with him, and him + Jura seems hilarious. Would it be a good idea, and if so, what could I cut?

Thanks a lot, and have a nice day =)