Havoc Festival 
Enchantment
$0.32 #8441 0.62 13.9 years
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 similar to Havoc Festival 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.
Dire Fleet Ravager92%
$0.25↓#6422↑0.29↓8.9 years↓
"When this creature enters, each player loses a third of their life, rounded up."
Giant Cindermaw90%
$0.10↓#10791↓0.17↓3.8 years↓
"Players can't gain life."
Heartless Hidetsugu88%
$2.87↑#3038↑0.97↑21.6 years↑
"
: this card deals damage to each player equal to half that player's life total, rounded down."
: this card deals damage to each player equal to half that player's life total, rounded down."
Scourge of the Skyclaves85%
$0.53↑#11670↓0.715.9 years↓
"When you cast this spell, if it was kicked, each player loses half their life, rounded up."
Everlasting Torment82%
$0.18↓#5415↑0.35↓18.3 years↑
"Players can't gain life."
Sunspine Lynx81%
$1.89↑#2813↑0.702.1 years↓
"Players can't gain life."
Rampaging Ferocidon81%
$1.30↑#2510↑0.728.9 years↓
"Players can't gain life."
Ebonblade Reaper80%
$5.58↑#98220.22↓23.9 years↑
"Whenever this creature deals combat damage to a player, that player loses half their life, rounded up."
Leyline of Punishment80%
$3.33↑#10480↓0.50↓16.1 years↑
"Players can't gain life."
Tibalt, Rakish Instigator79%
$0.27↓#11056↓0.577.3 years↓
"Your opponents can't gain life."
Grievous Wound78%
$0.61↑#3269↑1.11↑1.9 years↓
"Whenever enchanted player is dealt damage, they lose half their life, rounded up."
+1 more matching line
Forsaken Wastes78%
$14.81↑#14335↓0.87↑29.9 years↑
"At the beginning of each player's upkeep, that player loses 1 life."
+1 more matching line
Quakebringer78%
$1.10↑#87830.20↓5.6 years↓
"Your opponents can't gain life."
Knight of Dusk's Shadow77%
$0.26↓#100650.46↓4.0 years↓
"Your opponents can't gain life."
Fraying Omnipotence77%
$0.75↑#86210.85↑8.1 years↓
"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."
The Lord of Pain76%
$9.82↑#2339↑0.97↑1.9 years↓
"Your opponents can't gain life."
Witch Hunt76%
$0.38↑#16048↓0.21↓12.8 years↓
"Players can't gain life."
Pox76%
$1.44↑#97531.27↑31.3 years↑
"Each player loses a third of their life, then discards a third of the cards in their hand, then sacrifices a third of the creatures they control of their choice, then sacrifices a third of the lands they control of their choice. Round up each time."
Gríma Wormtongue75%
$0.22↓#91760.563.2 years↓
"Your opponents can't gain life."
Sulfuric Vortex74%
$0.88↑#2762↑0.6323.3 years↑
"At the beginning of each player's upkeep, this enchantment deals 2 damage to that player."
+1 more matching line