This paper craft is Caster's Rule Breaker, a weapon that materializes the divinity of the witch of betrayal, from the game / anime / manga series "Fate/Stay Night", the paper model is created by Roman Chayka.
The Rule Breaker is a iridescent and jagged dagger that is thin, brittle, and blunt. Its effectively nonexistent capacity as a weapon is that of a regular dagger at most, and it would not be suitable for even killing a single person. She is able to use it against normal humans, slaying her original Master and cleanly cutting off Shirou's arm without issue. Shown by the complex shape of the blade, its actual purpose is that of a key used for rituals that is described by Caster as an "indulgence from the Age of Gods that is forgiven anything for one purpose." Such ceremonial knives are designed as mere decoration, and like those, Rule Breaker was created unde the school of thought that it was never to be used as a weapon. Shirou feels an ominous feeling every time he encounters it, realizing it is dangerous to Servants after inadvertently analyzing it, manifesting as a feeling of pain in the Command Spells on his hand.
Greatly differing from other Noble Phantasms, its unique ability is that it is the ultimate anti-magic Noble Phantasm capable of dispelling and destroying any kind of thaumaturgy, an effect suitable to the Noble Phantasm that is a manifestation of Caster’s nature as the “Witch of Betrayal”. It "transgresses" on all the magecraft of the targets it pierces, contracts made from magical energy and life born from magical energy. Once it comes into contact with the ensorcelled item or person, enchantments, connections bounded through contracts, and creatures created and maintained by prana will all be returned to their original components in a state "before they were made." Contracts will be wiped clean and those with life will immediately cease to exist. There is a limit to what it is able to dispel, meaning artifacts on the rank of Noble Phantasm will never be returned to their original state no matter how low their rank.
While its uses are limited under normal means, it has high effectiveness in the Holy Grail War due to being able to manipulate the Servant System. It is a blade of betrayal that will sever all connections between a Master and Servant by destroying every single rule that controls them, giving full control of the Master's Command Spells to Caster. She uses this on both Saber and Archer, causing Shirou and Rin's Command Spells to instantly disappear and transfer to Caster after their contracts are nullified. The Servants themselves must be the target, as it has no effect on Shirou's contract with Saber from simply stabbing his flesh. It is also capable of severing Angra Mainyu's hold on Sakura Matou after it is projected by Shirou. [Source: wikia]
You may download this papercraft template here: Fate/Stay Night - Caster's Rule Breaker Free Papercraft Download