Commander's Plate Mono Commander Classic If you're playing a mono-colored deck, you always want to have Commander's Plate handy
To me, it seems quite out of place in red/green, especially with the self-mill plan being green/black
Another reason could be that WotC wanted to sell lots of sealed product in Alpha/Beta/Unlimited to generate interest
Authors note: For the sake of keeping this article at a somewhat readable length, I will be unable to go over each and every new card and reprint from these decks

Katara Wishboard Skeleton View on Archidekt Commander (1) 1 Katara, Seeking RevengeKatara, Seeking Revenge In-Deck Lesson Options (10) 1 Aang's JourneyAang's Journey 1 Accumulate WisdomAccumulate Wisdom 1 Azula Always LiesAzula Always Lies 1 Environmental SciencesEnvironmental Sciences 1 Expanded AnatomyExpanded Anatomy 1 Introduction to ProphecyIntroduction to Prophecy 1 Mascot ExhibitionMascot Exhibition 1 Sokka's HaikuSokka's Haiku 1 Teachings of the ArchaicsTeachings of the Archaics 1 Waterbending LessonWaterbending Lesson Wishes (10) 1 Arcane SubtractionArcane Subtraction 1 Cunning WishCunning Wish 1 Death WishDeath Wish 1 Divide by ZeroDivide by Zero 1 Dream StrixDream Strix 1 EyetwitchEyetwitch 1 Fae of Wishes // GrantedFae of Wishes // Granted 1 Hunt for SpecimensHunt for Specimens 1 Poet's QuillPoet's Quill 1 Pop QuizPop Quiz Sideboard (11) 1 Boomerang BasicsBoomerang Basics 1 Confront the PastConfront the Past 1 EnergybendingEnergybending 1 Introduction to AnnihilationIntroduction to Annihilation 1 It'll Quench YaIt'll Quench Ya 1 Mercurial TransformationMercurial Transformation 1 Octopus FormOctopus Form 1 Secret of BloodbendingSecret of Bloodbending 1 Water WhipWater Whip 1 Waterbender's RestorationWaterbender's Restoration 1 Zuko's ExileZuko's Exile Katara, Seeking RevengeKatara, Seeking Revenge is a commander that will see almost no play without a Wishboard option, because, as you can see, the Lesson card pool in Dimir is very small

If you pair this with a card like Ns plan, you can also move this energy from a Benched Pokmon to your Active Pokmon