Leyline of Combustion 
Enchantment
$0.59 #10587 0.28 7.2 years
If this card is in your opening hand, you may begin the game with it on the battlefield.
Whenever you and/or at least one permanent you control becomes the target of a spell or ability an opponent controls, this enchantment deals 2 damage to that player.
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Cards similar to Leyline of Combustion 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.
Retromancer91%
$0.15↓#30992↓0.00↓27.9 years↑
"Whenever this creature becomes the target of a spell or ability, this creature deals 3 damage to that spell or ability's controller."
Leyline of Anticipation82%
$3.40↑#735↑0.56↑16.1 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of the Void82%
$0.39↓#3454↑0.92↑20.6 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Lifeforce81%
$6.06↑#13118↓0.40↑20.6 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Sanctity80%
$0.28↓#7484↑0.3716.1 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
The Howling Abomination78%
$0.32↓#14785↓0.204.5 years↓
"Whenever this card becomes the target of a spell, it gets +2/+2 until end of turn and deals 2 damage to each opponent."
Leyline of Vitality78%
$3.31↑#112400.2516.1 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Punishment78%
$3.33↑#104800.50↑16.1 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of the Meek78%
$1.59↑#17299↓0.2921.0 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Transformation78%
$0.52↓#3544↑0.271.9 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Bonecrusher Giant // Stomp77%
$0.21↓#5839↑0.09↓6.9 years
"Whenever this creature becomes the target of a spell, this creature deals 2 damage to that spell's controller."
Leyline of Singularity76%
$4.74↑#14126↓0.3620.6 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Thunderbreak Regent75%
$0.31↓#3022↑0.2411.4 years↑
"Whenever a Dragon you control becomes the target of a spell or ability an opponent controls, this creature deals 3 damage to that player."
Leyline of Hope74%
$0.64↑#3441↑0.251.9 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline Axe74%
$3.28↑#1370↑0.241.8 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Mossdog72%
$0.11↓#27980↓0.00↓26.6 years↑
"Whenever this creature becomes the target of a spell or ability an opponent controls, put a +1/+1 counter on this creature."
Leyline of Resonance72%
$0.73↑#5344↑0.41↑1.9 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Livewire Lash71%
$0.19↓#12756↓0.00↓15.9 years↑
"Equipped creature gets +2/+0 and has "Whenever this creature becomes the target of a spell, this creature deals 2 damage to any target.""
Leyline of the Guildpact71%
$3.41↑#1738↑0.45↑2.6 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Deadeye Duelist70%
$0.10↓#16359↓0.00↓2.4 years↓
"
, 
: This creature deals 1 damage to target opponent."
, : This creature deals 1 damage to target opponent."