The most obvious option, by far, is using the Fling spell to instantly eliminate any defending opponent by throwing it right at their face
There are a couple cards that generically care about historic spells, which gives them extra reach outside the context of just this deck and other equipment decks in formats like Commander
The Ur-Dragon also has a game-ending effect once it hits the board, refilling your hand and slamming more dragons into play for free
By the way, you can receive the Buy-a-Box promotional version of Green Sun's Twilight by purchasing a Set, Draft, Collector, or Jumpstart Booster display at your local game store
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The other problem, of course, is that the social contract forbids true feudalism