You can cast this Elspeth planeswalker cheaply, use up its loyalty points with abilities, and then cast it from your graveyard
At the beginning of your upkeep, put a knowledge counter on The Magic Mirror, then draw a card for each knowledge counter on The Magic Mirror
Cyber Slash Harpie Lady X WIND Level 8 [ Winged BeastSynchroEffect ] ATK 2600 DEF 1400 1 Tuner + 1+ non-Tuner monsters For this card's Synchro Summon, you can treat 1 "Harpie" monster you control as a Tuner
Plus, when this card goes to the Graveyard you can add a specific monster from your Deck to your hand but the banishing effect is why this card makes the list
When those decks inevitably remove it, Dennick gets a second life in Dennick, Pious Apparition, which goes from stopping graveyard strategies to profiting off them with a stream of Clue tokens