Chthonian Nightmare Condition:Excellent Heldrakes are winged Daemon Engines

Heldrakes are winged Daemon Engines that plummet out of the skies like living comets

and weapon arms

Umbral Mantle

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you may exile that spell instead of putting it into its owner's graveyard as it resolves

Chthonian Nightmare Condition:Excellent Heldrakes are winged Daemon EnginesChthonian Nightmare Enchantment When Chthonian Nightmare enters the battlefield, you get {E}{E}{E} (three energy counters). Pay X {E}, Sacrifice a creature, Return Chthonian Nightmare to its owner's hand: Return target creature card with mana value X from your graveyard to the battlefield. Activate only as a sorcery. Set: Modern Horizons 3 Language: English