For a hefty 2 black and 5 generic mana, you get a sorcery that does the following: Destroy all creatures
Its first attack, Heavy Squall, allows a player to deal 60 damage to each of the opponent's ex Pokmon
Its a good fit in a Grist, the Hunger Tide deck since its already a commander that can dump a lot of cards into the graveyard
Notice that the zombie Jadar creates has the decayed keyword, which provides a form of self-sacrifice at the end of combat

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

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