[/spoiler] [spoiler='Valkrystal (Run 3)'] Normal Fusion Summon 1 "Valkyrie" Fusion Monster from your Extra Deck, using monsters from your hand or your side of the field as Fusion Materials, or by banishing monsters from your grave as the Fusion Materials
The exclusive weakness, He is an investigator whose evaluation is not very good
Cards you choose not to cast this way (or can't cast this way) remain in exile
By having Dark Sanctuary on the field, you are now able to summon your letters as monsters, which comes with, guess what, even more weird rulings
Side Note: the reason why I chose to only run 2 Swallow's Slashes instead of 3 was because a) I'd found that 45 was a good deck size, with an 85% chance of opening with a play that would lead into the minimum of Fraulein or Samuraisaga, so to add a third copy would mean either dropping Trinities or bumping up to 50 b) Swallow's Slash requires a Shiranui monster in your deck to be banished, so while running multiple copies would be good, they would typically lose their usefulness as the duel would go on due to not always having Shiranuis in the deck to be able to resolve it