Leyline of Lifeforce 
Enchantment
$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.
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 Herald98%
$1.18↓#124611.40↑25.6 years↑
"Creature spells can't be countered."
Prowling Serpopard96%
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"Creature spells you control can't be countered."
Surrak Dragonclaw92%
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"Creature spells you control can't be countered."
Insist90%
$2.06↓#17489↓0.07↓24.6 years↑
"The next creature spell you cast this turn can't be countered."
Vexing Shusher90%
$6.27↑#5497↑0.3518.3 years↓
"This spell can't be countered."
Frenzied Baloth86%
$1.78↓#2477↑0.441.1 years↓
"Creature spells you control can't be countered."
Sphinx of the Final Word86%
$0.20↓#10087↑0.14↓10.6 years↓
"This spell can't be countered."
Root Sliver86%
$6.15↑#6439↑0.3323.6 years↑
"This spell can't be countered."
Savage Summoning84%
$2.14↓#9856↑0.3513.1 years↓
"This spell can't be countered."
Rhythm of the Wild84%
$4.27↓#216↑0.417.6 years↓
"Creature spells you control can't be countered."
Spellbreaker Behemoth84%
$0.78↓#10482↑0.13↓17.3 years↓
"This spell can't be countered."
Chimil, the Inner Sun82%
$9.64↑#759↑0.74↑2.8 years↓
"Spells you control can't be countered."
Leyline of Anticipation81%
$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 Void81%
$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 Combustion81%
$0.59↓#105870.28↓7.2 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Lier, Disciple of the Drowned79%
$0.96↓#2185↑0.62↑4.9 years↓
"Spells can't be countered."
Leyline of Sanctity79%
$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."
Allosaurus Shepherd78%
$50.03↑#1681↑0.83↑6.1 years↓
"This spell can't be countered."
Leyline of Vitality78%
$3.31↓#112400.25↓16.1 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."
Leyline of Punishment78%
$3.33↓#10480↑0.5016.1 years↓
"If this card is in your opening hand, you may begin the game with it on the battlefield."