38 cards where the card is tagged “rules-nightmare”

Alpine Moon (Core Set 2019 #128)
Ambiguity (Unhinged #24)
Animate Dead (Murders at Karlov Manor Commander #125)
Arcum's Sleigh (Ice Age #309)
Blood Moon (Double Masters #118)
Blood Sun (Rivals of Ixalan #92)
Camouflage (Unlimited Edition #188)
Chains of Mephistopheles (Masters Edition #63)
Chromatic Sphere (Jumpstart #462)
Circling Vultures (Weatherlight #64)
Curse of the Fire Penguin // Curse of the Fire Penguin Creature (Unhinged #73)
Diaochan, Artful Beauty (Portal Three Kingdoms #108)
Dryad Arbor (Time Spiral Remastered #277)
Elemental Resonance (Dissension #83)
Equinox (Legends #13)
Ertai's Meddling (Tempest #61)
Humility (Tempest Remastered #16)
Ice Cauldron (Masters Edition IV #206)
Illusionary Mask (Masters Edition III #197)
Karmic Justice (Commander 2015 #72)
Library of Leng (Masters Edition IV #211)
Life and Limb (Time Spiral Remastered #215)
Magus of the Moon (Time Spiral Remastered #175)
"Name Sticker" Goblin (Unfinity #107m)
Old Fogey (Unsanctioned #67)
Opalescence (Urza's Destiny #13)
Opposition Agent (Commander Legends #141)
Optimus Prime, Inspiring Leader (2018 Heroes of the Realm #2)
Overwhelming Splendor (Hour of Devastation #19)
Painter's Servant (Shadowmoor #257)
Panglacial Wurm (Coldsnap #116)
Raging River (Unlimited Edition #169)
Selvala, Explorer Returned (Murders at Karlov Manor Commander #218)
Shahrazad (Arabian Nights #10)
Takklemaggot (Masters Edition III #76)
Volrath's Shapeshifter (Vintage Masters #101)
Word of Command (Masters Edition IV #103)
Yixlid Jailer (Time Spiral Remastered #149)

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