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The other differentiating element here is the fact that Aunt May is legendary

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With access to enough colorless mana and a creature that generates mana on ETB, Displacer can set up easy infinite combos, one of which was even possible in its Standard format alongside Brood Monitor and Zulaport Cutthroat

You cannot respond to discarding the card though, since that's a cost of activating the cycling ability

Bolass Citadel Bolas's Citadel offers instant-speed card information on the top of your library and also lets you cast spells from the top of your library by paying life, including playing lands