|First Appearance (Manga): Chapter 4|
|First Appearance (Anime): Episode 2|
Siege appears as a large white rubber cube with a spiral vine-like design decorating its sides. These vines swirl out and around the cube in its card form.
Magic and Abilities
- Imprison Inducement: Siege has the power to project its form around beings, using its own body as a prison. However, Tomoyo was able to break free by pricking Siege with a pin, so the strength of this card's imprisoning power is questionable.
- Superhuman Flexibility: Siege can become flexible, either being soft or hard at Sakura's will.
- Size-Shifting: It is also capable of changing its size, as it was able to shrink itself around Aqua, and expand to trap Action and Swing. However it could not overlap Labyrinth as it trapped them in its own pocket dimension.
- Selective Permeation: By command it can trap whatever it is ordered to, allowing it to phase through certain objects and beings.
- Transparency: Siege is shown that it can be transparent at Sakura's will.
- Magic Protection: Siege is able to protect those inside him from external magic, much as The Shield. Even Kaito's time magic is avoided by it.
- The kanji at the top of the card: 包囲 (Pronounced 'Houi') means 'siege, encirclement, envelopment, or surrounding' in Japanese.
- Cardcaptor Sakura: Clear Card Arc, Chapter 4, Pages 14-20
- Cardcaptor Sakura: Clear Card Arc, Episode 4
- Cardcaptor Sakura: Clear Card Arc, Episode 16
- Cardcaptor Sakura: Clear Card Arc, Episode 5