Nightshade Harvester 
Creature — Elf Shaman
$0.36 #4775 0.28 5.9 years
Whenever a land an opponent controls enters, that player loses 1 life. Put a +1/+1 counter on this creature.
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Cards similar to Nightshade Harvester 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.
Polluted Bonds92%
$5.25↑#3731↑0.62↑18.5 years↑
"Whenever a land an opponent controls enters, that player loses 2 life and you gain 2 life."
Foe-liage92%
$0.18↓#25936↓0.16↓0.6 years↓
"Whenever a land enters during your turn, put a +1/+1 counter on this creature."
Dirtcowl Wurm89%
$2.30↑#16235↓0.67↑29.1 years↑
"Whenever an opponent plays a land, put a +1/+1 counter on this creature."
Shattered Angel86%
$0.51↑#6694↓0.07↓15.4 years↑
"Whenever a land an opponent controls enters, you may gain 3 life."
Ob Nixilis, the Fallen85%
$2.72↑#1945↑0.53↑17.0 years↑
"Whenever a land you control enters, you may have target player lose 3 life. If you do, put three +1/+1 counters on this card."
Lifegift84%
$11.55↑#11485↓0.15↓21.7 years↑
"Whenever a land enters, you may gain 1 life."
Sazh's Chocobo77%
$0.51↑#2990↑0.44↑1.4 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Vinelasher Kudzu77%
$0.35↓#13535↓0.00↓21.0 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Territorial Scythecat77%
$0.16↓#8109↓0.246.1 years
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Prowling Felidar77%
$0.17↓#14289↓0.206.1 years
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Tectonic Instability74%
$3.76↑#14399↓1.50↑26.0 years↑
"Whenever a land enters, tap all lands its controller controls."
Seed the Land73%
$5.62↑#16765↓0.06↓21.4 years↑
"Whenever a land enters, its controller creates a 1/1 green Snake creature token."
Ankh of Mishra72%
$8.82↑#50301.01↑33.2 years↑
"Whenever a land enters, this artifact deals 2 damage to that land's controller."
Archaeomancer's Map72%
$0.88↑#680↑0.245.5 years
"Whenever a land an opponent controls enters, if that player controls more lands than you, you may put a land card from your hand onto the battlefield."
Murasa Ranger72%
$0.08↓#27217↓0.00↓11.0 years↑
"Whenever a land you control enters, you may pay 
. If you do, put two +1/+1 counters on this creature."
. If you do, put two +1/+1 counters on this creature."
Blood Seeker71%
$0.22↓#2710↑0.2717.0 years↑
"Whenever a creature an opponent controls enters, you may have that player lose 1 life."
Invader Parasite70%
$0.23↓#20195↓0.13↓15.4 years↑
"Whenever a land an opponent controls with the same name as the exiled card enters, this creature deals 2 damage to that player."
Spectrum Sentinel70%
$0.44↑#56860.56↑3.9 years↓
"Whenever a nonbasic land an opponent controls enters, you gain 1 life."
Tunnel Ignus70%
$0.53↑#18522↓0.41↑16.1 years↑
"Whenever a land enters under an opponent's control, if that player had another land enter the battlefield under their control this turn, this creature deals 3 damage to that player."
Undergrowth Champion70%
$0.38↑#8504↓0.00↓11.0 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."