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: This creature gets +X/+0 until end of turn, where X is the sacrificed enchantment's mana value.
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Cards that do something similar expected a card that isn't here?
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Cramped Vents // Access Maze 88%
$0.35#7076
"Once during each of your turns, you may cast a spell from your hand by paying life equal to its mana value rather than paying its mana cost."