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Not bad.
I would probably look into maindecking some number of Meddling Mage as a replacement for Thalia. Naming Terminus is a half decent plan against Miracles.

Buried Ruin as a way to return...

The thread title says GW/x, but I agree that if Rouge's Passage get the same job done, then it is superior.
I do think it is important to win the game on the spot, giving the opponent a turn to find...

We only need one red mana source in the deck, and there is the question of reaching 20 damage.

Good point on the TNN. Didn't even think about that, but yes Trample comes in handy there.

So let's assume we have an active Knight, and cast Retreat to Coralhelm. Opponent can use removal with...

If not enough lands, just include a Kessig Wolf Run, this also gives us something to do with the excess mana.

I am assuming he doesn't have removal, because he would likely have used it at the...

Just tap all blockers and attack with a 20/20 knight?

It looks promising.
Am I overlooking something: Get a fetch with Knight, fetch with Retreat untap trigger on the stack, tap land for mana, untap Knight to get a new fetch.
Don't we end up with +1...