R.E.N. Spells Ren
Veteran
Littlefinger is a demon man. He's the Frank Underwood of Westeros. IIRC, he wanted to cause a war between The Starks and The Lannisters. During chaos, nobody pays attention to the nikka in the background making moves. So he gave Tyrion's blade to the assassin. I think he wanted to implicate Tyrion on purpose and "get rid of him" because Tyrion is one of the two people, along with Varys, that REALLY know the kind of nikka he is If you notice, when Joffrey gets murdered, he plants the murder on Tyrion again. It was to get Sansa out of their marriage, but I think he just wants Tyrion dead too lol....I think Littlefinger is planning on murdering the crazy aunt, getting The Vale, then marrying Sansa, getting The North, and then uniting with The Riverlands too Nikka is thinking fifty steps ahead of everyone else. Back when Stannis was marching on King's Landing and Renly had just got murdered, Littlefinger offered to go meet with The Tyrells to make an agreement. Nikka just forgot to tell Tywin that the agreement included murdering Joffrey
That was his blade, tho. He lost it to Tyrion (purposely, or not)...how could he have gotten that blade to Bran's attempted killer?
Unless he had his assassin steal it from Tyrion.