Rumbling Slum 
Creature — Elemental
$0.25 #26639 0.79 20.6 years
At the beginning of your upkeep, this creature deals 1 damage to each player.
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Cards similar to Rumbling Slum 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.
Copper Tablet97%
$56.45↑#15363↑0.11↓33.1 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Spear Spewer94%
$0.20↓#5043↑0.19↓7.6 years↓
"
: This creature deals 1 damage to each player."
: This creature deals 1 damage to each player."
Barbed Wire94%
$1.77↑#13458↑0.40↓26.9 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Impatience91%
$0.29↑#227860.31↓27.2 years↑
"At the beginning of each player's end step, if that player didn't cast a spell this turn, this enchantment deals 2 damage to that player."
Plague Spitter90%
$0.45↑#7520↑0.33↓25.9 years↑
"At the beginning of your upkeep, this creature deals 1 damage to each creature and each player."
Flame Rift90%
$0.32↑#3984↑0.20↓26.6 years↑
"this card deals 4 damage to each player."
Rivalry90%
$0.38↑#255460.32↓27.6 years↑
"At the beginning of each player's upkeep, if that player controls more lands than each other player, this enchantment deals 2 damage to them."
Mask of Intolerance90%
$0.28↑#302920.50↓25.3 years↑
"At the beginning of each player's upkeep, if there are four or more basic land types among lands that player controls, this artifact deals 3 damage to that player."
Antagonism89%
$0.41↑#254730.10↓27.9 years↑
"At the beginning of each player's end step, this enchantment deals 2 damage to that player unless one of their opponents was dealt damage this turn."
Razor Pendulum89%
$0.53↑#301860.24↓29.9 years↑
"At the beginning of each player's end step, if that player has 5 or less life, this artifact deals 2 damage to that player."
Roiling Vortex88%
$1.96↑#2476↑0.45↓5.9 years↓
"At the beginning of each player's upkeep, this enchantment deals 1 damage to them."
Power Surge88%
$1.11↑#11497↑0.43↓33.1 years↑
"At the beginning of each player's upkeep, this enchantment deals X damage to that player, where X is the number of untapped lands they controlled at the beginning of this turn."
Coalhauler Swine86%
$0.16↓#15315↑0.00↓20.9 years
"Whenever this creature is dealt damage, it deals that much damage to each player."
Furnace Punisher86%
$0.07↓#21158↑0.50↓3.6 years↓
"At the beginning of each player's upkeep, this creature deals 2 damage to that player unless they control two or more basic lands."
Spawn of Mayhem86%
$0.55↑#10653↑0.25↓7.6 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each player. Then if you have 10 or less life, put a +1/+1 counter on this creature."
Slagstorm85%
$0.35↑#7267↑0.25↓15.6 years↓
"• this card deals 3 damage to each player."
Thrashing Wumpus85%
$0.94↑#20469↑0.24↓26.9 years↑
"
: This creature deals 1 damage to each creature and each player."
: This creature deals 1 damage to each creature and each player."
Crimson Honor Guard84%
$0.22↓#17066↑0.38↓9.0 years↓
"At the beginning of each player's end step, this creature deals 4 damage to that player unless they control a commander."
Pestilence Demon84%
$0.53↑#10118↑0.47↓16.4 years↓
": This creature deals 1 damage to each creature and each player."
: This creature deals 1 damage to each creature and each player."
Pestilence84%
$0.30↑#4028↑0.57↓33.1 years↑
": This enchantment deals 1 damage to each creature and each player."
: This enchantment deals 1 damage to each creature and each player."