Leyline of Combustion 
Enchantment
$0.41 #10910 0.21 7.3 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%
$0.17↓#31274↓0.1128.0 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%
$4.58↑#758↑0.70↑16.3 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Sanctity80%
$0.26↓#7614↑0.47↑16.3 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
The Howling Abomination79%
$0.35↓#15132↓0.50↑4.7 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 Vitality79%
$3.18↑#113480.00↓16.3 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Lifeforce78%
$5.97↑#13322↓0.62↑20.7 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Punishment78%
$2.87↑#106810.59↑16.3 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of the Meek78%
$1.42↑#17588↓0.33↑21.2 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of the Void78%
$0.35↓#3542↑1.19↑20.7 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Transformation78%
$0.54↑#3560↑0.262.1 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Bonecrusher Giant // Stomp77%
$0.22↓#6001↑0.127.0 years
"Whenever this creature becomes the target of a spell, this creature deals 2 damage to that spell's controller."
Leyline of Singularity76%
$5.45↑#14298↓0.2820.7 years↑
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Thunderbreak Regent75%
$0.25↓#3014↑0.2111.6 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%
$0.75↑#3376↑0.35↑2.1 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline Axe74%
$4.40↑#1352↑0.32↑1.9 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Mossdog72%
$0.11↓#28391↓0.00↓26.7 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%
$0.77↑#5405↑0.95↑2.1 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Livewire Lash71%
$0.19↓#130320.05↓16.1 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 Guildpact70%
$4.21↑#1722↑0.35↑2.7 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Deadeye Duelist70%
$0.11↓#16796↓0.05↓2.5 years↓
"
, 
: This creature deals 1 damage to target opponent."
, : This creature deals 1 damage to target opponent."