yu gi oh master duel deck building Yu-Gi-Oh Duel: Eldlich guide Build and optimize your yugioh

Its Shadow Impact attack does a modest 130 damage while placing 4 damage counters on one of your own Pokmon

Jeff does a great breakdown of the deck in his gameplay video, so Ill just paraphrase his analysis

The final piece that makes this deck work is Knightmare Corruptor Iblee , as it can be brought to the field through a variety of combo chains, to then use as Link Material and prevent your opponent from Special Summoning

(1) Ritual Summon 1 Black Chaos the Dark Chaos Magician or Black Luster Soldier Soldier of Light and Darkness from your hand, by Tributing monsters from your hand or field and/or banishing monsters from your GY, whose total Levels equal or exceed its Level

If they had no cards in hand, or only one or two other cards, then theyre either guaranteed to discard the character you bounced back, or are getting rid or something equally valuable to them