Power Leak 
Enchantment — Aura
$0.15 #27539 0.39 33.2 years
Enchant enchantment
At the beginning of the upkeep of enchanted enchantment's controller, that player may pay any amount of mana. This Aura deals 2 damage to that player. Prevent X of that damage, where X is the amount of mana that player paid this way.
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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.
Errant Minion96%
$0.16↑#295840.10↓31.4 years↓
"At the beginning of the upkeep of enchanted creature's controller, that player may pay any amount of mana. This Aura deals 2 damage to that player. Prevent X of that damage, where X is the amount of mana that player paid this way."
Feedback96%
$0.22↑#282990.17↓33.2 years
"Enchant enchantment"
+1 more matching line
Power Taint88%
$0.21↑#265790.22↓28.0 years↓
"Enchant enchantment"
+1 more matching line
Parasitic Bond86%
$0.40↑#298280.19↓28.0 years↓
"Enchant creature"
+1 more matching line
Cursed Land84%
$0.21↑#255070.16↓33.2 years
"At the beginning of the upkeep of enchanted land's controller, this Aura deals 1 damage to that player."
Wanderlust82%
$0.14↓#296550.07↓33.2 years
"Enchant creature"
+1 more matching line
Maddening Wind80%
$0.19↑#314390.61↑31.4 years↓
"Enchant creature"
+1 more matching line
Festering Wound78%
$0.29↑#225930.28↓27.4 years↓
"At the beginning of the upkeep of enchanted creature's controller, this Aura deals X damage to that player, where X is the number of infection counters on this Aura."
Warp Artifact78%
$0.32↑#292720.12↓33.2 years
"At the beginning of the upkeep of enchanted artifact's controller, this Aura deals 1 damage to that player."
Insubordination78%
$0.08↓#277880.17↓27.0 years↓
"At the beginning of the end step of enchanted creature's controller, this Aura deals 2 damage to that player unless that creature attacked this turn."
Stab Wound75%
$0.12↓#9171↑0.06↓14.0 years↓
"Enchant creature"
+1 more matching line
Tattoo Ward74%
$0.16↑#296580.12↓25.1 years↓
"Enchant creature"
Gremlin Infestation74%
$0.04↓#293400.26↓9.7 years↓
"At the beginning of your end step, this Aura deals 2 damage to enchanted artifact's controller."
Gaseous Form73%
$0.07↓#245750.26↓32.4 years
"Enchant creature"
+1 more matching line
Leeching Licid73%
$0.16↑#299910.12↓29.0 years↓
"At the beginning of the upkeep of enchanted creature's controller, this creature deals 1 damage to that player."
Contaminated Bond72%
$0.11↓#20001↑0.12↓23.0 years↓
"Enchant creature"
Brand of Ill Omen72%
$1.72↑#265020.98↑31.4 years↓
"Enchant creature"
+1 more matching line
Unnatural Hunger72%
$2.63↑#256510.3827.0 years↓
"Enchant creature"
+1 more matching line
Sinister Possession72%
$0.08↓#18637↑0.14↓13.5 years↓
"Enchant creature"
Psychic Venom72%
$0.13↓#246070.07↓33.2 years
"Whenever enchanted land becomes tapped, this Aura deals 2 damage to that land's controller."