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Breya, Etherium ShaperBreya, Etherium Shaper has famously risen to be one of the most popular commanders in EDHREC history with over 2,200 reported decks

Transforming this card into Green Goblin, or just casting it outright means youll have cost reduction on all spells you cast from your graveyard (not only instants and sorceries), and you can set up an engine where you discard a card and immediately cast it for a reduced cost

Honorable Mentions I also want to give an honorable mention to cards that exile opposing creatures when they die like Misery's Shadow and Nemata, Primeval Warden

I doubt it.

Translation pending Ditto Ability: Transforming Start You may use this Ability once during your first turn if this Pkmn is in the Active Spot