Perhaps you want to leave your three-drops sticking around while taking out your opponents two-drops
When this card is activated, pay half of your LP, Choose one card with an effect that you have used during the duel, you can add that card to the hand and reuse the effect, ignoring it's activation conditions
Progress and improvement toward meeting grade level standards should certainly be acknowledged
Thanks to Limited decks only being 40 cards, theres a good chance you can mulligan or draw into this combo
They also feature the most popular legendaries from gen 2-4 but just because its not a umbreon or a charizard people dont care about them these days
Once the early game has been locked down, though, Ugin's Labyrinth can also be the last card needed to close the door