This card would work in a "Lightsworn" Deck by overlaying two "Judgment Dragons" (in case something interferes with their effects, or prevents them from attacking). Also, its effect can be used alongside the milling effects of the "Lightsworns".
You can use "Mount Sylvania" to place a "Sylvan" on the top of your Deck, then declare a wrong name on purpose to activate both effects, this card can activate its effect and so the the milled "Sylvan" monster, possibly granting field advantage and control over the opponent's Deck.