If this card is sent from the Deck to the GY: You can target 1 "Lightsworn" monster in your GY, except "Vice, Lightsworn Archfiend"
In fact, "once per duel" restrictions are even worse than declaring a card limited, usually, because they mean you are intentionally overdesigning a card and justifying it with an inelegant clause, when you could simply make a more fair card
The weakness of this build is that it tends to brick if you draw only Thomas, D/D/D Oblivion King Abyss Ragnarok, and D/D/D Doom King Armageddon as unlike Blue-Eyes, which has a lineup of level8 monsters as well, D/D/D doesn't have a Blue-Eyes Alternative Dragon which can special summon itself via its own effect
ZEUS Sky Thunder can provide a last-second boost by wiping the board clean, while Accesscode Talker can use Drytron Monsters to come out to the field, and pop cards