Im mentioning them because you could argue that Stranger Things and The Walking Dead suit the season, especially the black and white episodes of TWD
Im also only considering cards that reduce the cost of other spells, not cards that reduce their own casting cost
How To Play The Deck A Dion, Bahamut's Dominant Commander deck is always casting Knight spells and attacking with them, providing extra damage with permanents that give stat boosts
This value is now embedded in its DNA
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On the reprint side, Living Death is the headliner, a mass-reanimation spell that shows up in plenty of black Commander decks, with Caged Sun and Sceptre of Eternal Glory backing it up on the mana side and Mystic Forge keeping the artifacts flowing