If this card attacks a Defense Position monster, before damage calculation: Shuffle that monster into the Deck. Once per turn, during your End Phase: Send the top 3 cards of your Deck to the Graveyard.
The Lightsworn archetype has a lot of useful Warrior monsters. You can summon them alongside Ehren to be able to make use of Twilight Eraser. Charge of the Light Brigade can search low-leveled Lightsworn monsters and is a good card to use in decks that mix Lightsworns for milling.
Also I find it really strange that Blair does not have any voiceline for Minerva, despite being a "Lightsworn" and a "Maiden" at the same time......even Minerva's full name in Japan has "Maiden" in it, so it's not like it's a translation issue either.
JD won't be good if we don't get the really usefull LS cards: charge of the light brigade and solar recharge. Turn one with LS will be awfull other wise even with grass. And of course you may mill JD :'(