Demon of Fate's Design {4}{B}{B}

Enchantment Creature — Demon

Flying, trample

Once during each of your turns, you may cast an enchantment spell by paying life equal to its mana value rather than paying its mana cost.

{2}{B}, Sacrifice another enchantment: Demon of Fate’s Design gets +X/+0 until end of turn, where X is the sacrificed enchantment’s mana value.

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Prints	USD	EUR	TIX
Duskmourn: House of Horror Commander	$0.18	€0.26	0.83
Commander Masters #731	$0.37	€0.51	1.35
Commander Masters #762	$1.55	€0.98	1.39
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If you cast a spell for another cost "rather than paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, those must be paid to cast the card. (2023-07-28)

If you cast a spell with {X} in its mana cost this way, the only legal choice for X is 0. (2023-07-28)