This seems to work in my head, anyone see any problems with it? I understand how Dragon Sight changes the way a challenge works so I don't need that whole lengthy explanation.
Play the Egg on an Attachment, when Challenges come I declare attackers then Ambush Dragon Sight in during the window before declaring Stealth… this essentially allows me to make a challenge in which my opponent never gets an opportunity to declare defenders?

On the face of it, sure. However, the text of Dragon Sight is:

"Attach to your House card. If it is Summer, when y ou declare a challenge type , your opponent must declare defenders before you declare attackers. The opportunity for your opponent to declare defenders after you declare attackers is lost."

Because of the "when" in that text for applying its effect, there is a very solid argument that Dragon Sight will not affect a challenge if it is not in play "when" the challenge is declared.

So it's clever, but I'd personally say that if Dragon Sight misses the challenge declaration, it's effect is not applied to the challenge.

Hard to argue with that logic.

Tangential question. Is there a precedent for changing the framework mid-framework? For example, this would be making step 1 of the framework become step 3 of the framework (or whatever it would be). I can't think of another card that tries to do that.

mdc273 said:

There is no precedent for changing the framework of a window in the middle of a window. It's always "initiate, save/cancel, resolve, passive, response, end." So there is nothing that lets you get the effect before paying the cost, for example.

However, there is precedent for changing the order of play. For example, card effects have added Epic phases, added challenges to other phases, re-played the challenge phase, renamed the First Player, or skipped the standing phase. Or there are replacement effect cards that "transform" framework events that normally work one way into working a different way. Dragon Sight kind of combines both ideas. It changes the order of play by transforming the framework events in the "initiate challenge" and "declare defenders" framework action windows (adding a "declare defenders" event to one and removing it from the other).

So the structure of action windows doesn't really change, but the order of phases and the "default flow" of the action windows within them can change. Luckily, it's all card driven, so you only really need to know what is on the card that is played, not subtleties in the rules.