"'''Jar'''", known as either "'''Pod'''" (ポッド ''Poddo'') or "'''Pot'''" (ポット ''Potto'') in Japanese, are a [[series]] of low-[[Level]] [[Flip Effect Monster]]s that help the [[controller]] and/or the opponent gain [[Field advantage|field]] and [[hand advantage]]. Because of their good effects, "[[Fiber Jar]]" and "[[Cyber Jar]]" have been [[Forbidden]], while "[[Morphing Jar]]" has been [[Limited]].