Havoc Festival {4}{B}{R}
Enchantment
Players can't gain life.
At the beginning of each player's upkeep, that player loses half their life, rounded up.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Pox Plague 81%
$0.33#11937
"Each player loses half their life, then discards half the cards in their hand, then sacrifices half the permanents they control of their choice. Round down each time."
Fraying Omnipotence 81%
$1.04#8473
"Each player loses half their life, then discards half the cards in their hand, then sacrifices half the creatures they control of their choice. Round up each time."
Call In a Professional 86%
$0.18#15972
"Players can't gain life this turn. Damage can't be prevented this turn. this card deals 3 damage to any target."