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Davies said in a press release

While this already makes for a particularly unique commander dynamic, Kibo also states that whenever it attacks, the defending player must sacrifice an artifact, allowing you to deprive opponents of key resources as you apply pressure in combat

Tarkir: Dragonstorm Update Bulletin Read all about the rules changes and updates arriving with Tarkir: Dragonstorm

This allows you to bypass the casting costs of high-impact permanents like Portal to Phyrexia or Blightsteel Colossus

It's amazing how quickly people will attack somewhere else when they have to pay to attack you, and shutting down activated abilities or making tough choices is a real problem for people