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I get it now, thanks. I thought he was putting both Citadel and GQ in his graveyard, and that's the part I was missing: he targets it, sacs GQ, gets a basic but keeps his Citadel.

I don't see how you are destroying an indestructible land:


Ghost Quarter
Darksteel Citadel

Just reading the two cards, without a judge, tells me 'no, you cannot do this.'

However, it...

Not trying to rules-lawyer here, but how are you Ghost Quarter-ing your own Darksteel Citadel?

The deck looks interesting, but I don't think its *quite* as streamlined as you seem to claim it is....