Leyline of Lifeforce 
Enchantment
$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.
Creature spells can't be countered.
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Cards similar to Leyline of Lifeforce 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.
Gaea's Herald95%
$1.06↓#126800.51↓25.7 years↑
"Creature spells can't be countered."
Prowling Serpopard94%
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"Creature spells you control can't be countered."
Surrak Dragonclaw87%
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"Creature spells you control can't be countered."
Vexing Shusher86%
$5.45↓#5740↑0.80↑18.5 years↓
"This spell can't be countered."
Insist86%
$2.06↓#17782↓0.07↓24.7 years↑
"The next creature spell you cast this turn can't be countered."
Frenzied Baloth82%
$2.06↓#2275↑0.49↓1.2 years↓
"Creature spells you control can't be countered."
Rhythm of the Wild80%
$4.32↓#223↑0.48↓7.7 years↓
"Creature spells you control can't be countered."
Root Sliver80%
$6.03↑#6463↑0.88↑23.7 years↑
"This spell can't be countered."
Sphinx of the Final Word80%
$0.53↓#8694↑0.5610.7 years↓
"This spell can't be countered."
Savage Summoning80%
$2.51↓#9804↑0.47↓13.3 years↓
"This spell can't be countered."
Leyline of the Meek80%
$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 Void80%
$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."
Spellbreaker Behemoth79%
$0.76↓#10654↑0.19↓17.5 years↓
"This spell can't be countered."
Leyline of Anticipation78%
$4.58↓#758↑0.7016.3 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Combustion78%
$0.41↓#109100.21↓7.3 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Singularity78%
$5.45↓#142980.28↓20.7 years
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Chimil, the Inner Sun78%
$7.85↑#743↑0.73↑2.9 years↓
"Spells you control can't be countered."
Leyline of Sanctity76%
$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."
Allosaurus Shepherd75%
$50.90↑#1677↑0.83↑6.3 years↓
"This spell can't be countered."
Lier, Disciple of the Drowned75%
$1.23↓#2183↑0.585.1 years↓
"Spells can't be countered."