sphinx cards mtg Enigma [Planechase Anthology] The Gathering Conundrum Sphinx (Commander 2018)

I like this one a lot

You can make a deck that maximizes drawing and discarding to cast Mascot Exhibition or Overwhelming Victory from your graveyard

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Or is it Yawgmoths Witnesses

The Final Fantasy mythic has a jaw-dropping text box, giving a counter whenever you cast a noncreature spell while also dealing a damage to your opponent and then, once each turn, letting you make mana equal to its power for free