I pass to my combat phase and wait to declare my 6/8 kor as an attacker.

He's attacking!
Fel, back on you.

I won't do anything, but just a heads-up, Neo: I should have a chance to respond after his MP1 but before he declares attackers.

Aha...yup, you are correct. If you (either of you) ever feel like you've missed a chance to do something, and want to do something, just let me know - we can backtrack most of the time (like here, for example).
I'm trying to balance moving this along, with not missing anything. I'm really only waiting a bunch if there's something that I would post to the game (like a new card, or something like that) that would change the state before moving along.

OK - I'll update the OP, deduct the damage and move back to True's 2nd main phase.

I phrased it like that to imply I would be giving time for a Fel's response and making my play at the same time. Not sure if I did right.

I pass the turn and I pass all until the start of my next turn.

We're all figuring this out together!

OK - Fel, back to you. You can take any end step actions you want, if not, let me know, and I'll ship another card over to you.

I'm good. Send me my card, please

EDIT: Not going to double post, so here we go:

MP1 play Island, tap 5 to cast Mind Control, targeting Kor#1, which I believe is the one enchanted by Armored Ascension.

Since True's tapped out, I would like to procede to CP and attack with my Lord, if you don't mind.

Ouch!

But I won't block.

Combat proceeds as normal and after that I'll just pass the turn.

OK.
So, Kor#1 is now under Fel's control.
It was 6/8, but, with Mind Control, it's now 8/10
The Lord attacked, and was unblocked, dealing 2 damage.
I'll update the OP in a few minutes.
Fel, anything in MP2?
True, I was going to ask you, but, since you are tapped out, and passed till your next turn, I guess not.
So, Fel, once I update, it's on you to do something, or pass till the next turn.

Edit: I just saw your post...I'll update the OP with all these changes, and then throw a card to True for the start of his turn

I play a Plain and tap 2 plains to play Pacifism targeting my stolen Kor Spiritdancer, triggering the ability of my remaining Kor.

Sorry - been a busy day.
Pacifism is on the stack, heading towards the stolen Spirtdancer.
True - your card is on it's way - Fel - priority is on you

Well, at least I got a 3-for-1. Pacifism Resolves.

I tap 3 plains and play Griffin Guide targeting my 0/2 Kor Spiritdancer, triggering the ability from kor again.

On it's way!

Fel - any actions, or back to True?

In response, Tap 1 Island and cast Unsummon, targeting Kor#2 (the one controlled by True).

I do nothing, but . Pass the turn.

Just to clarify, don't you have 8 cards in hand right now, True?

No, only 7.

I ask because the OP says you had 7 cards when Griffin Guide was on the stack, and then I bounced your Kor back to your hand. Doesn't that make it 8?