Rafter Demon 


Creature — Demon
Spectacle {3}{B}{R} (You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.)
When this creature enters, if its spectacle cost was paid, each opponent discards a card.
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Cards that do something similar expected a card that isn't here?
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Bladecoil Serpent 86%
$0.31#24302
"When this creature enters, for each {B}{B} spent to cast it, each opponent discards a card."