Nightshade Harvester 
Creature — Elf Shaman
$0.36 #4497 0.29 5.8 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?
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Polluted Bonds92%
$6.30↑#36400.62↑18.3 years↑
"Whenever a land an opponent controls enters, that player loses 2 life and you gain 2 life."
Foe-liage92%
$0.29↓#26372↓0.00↓0.5 years↓
"Whenever a land enters during your turn, put a +1/+1 counter on this creature."
Dirtcowl Wurm89%
$2.32↑#15889↓0.41↑28.9 years↑
"Whenever an opponent plays a land, put a +1/+1 counter on this creature."
Shattered Angel86%
$0.46↑#6869↓0.11↓15.3 years↑
"Whenever a land an opponent controls enters, you may gain 3 life."
Ob Nixilis, the Fallen85%
$2.03↑#1963↑0.61↑16.9 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%
$10.24↑#12056↓0.2621.6 years↑
"Whenever a land enters, you may gain 1 life."
Territorial Scythecat78%
$0.16↓#7958↓0.385.9 years
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Vinelasher Kudzu78%
$0.34↓#13232↓0.56↑20.9 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Sazh's Chocobo78%
$1.12↑#3068↑0.371.2 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Prowling Felidar78%
$0.18↓#14068↓0.67↑5.9 years
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Tectonic Instability74%
$3.63↑#14120↓1.35↑25.9 years↑
"Whenever a land enters, tap all lands its controller controls."
Archaeomancer's Map74%
$1.03↑#724↑0.235.4 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."
Seed the Land73%
$4.97↑#16529↓0.3321.3 years↑
"Whenever a land enters, its controller creates a 1/1 green Snake creature token."
Ankh of Mishra72%
$8.84↑#48951.04↑33.1 years↑
"Whenever a land enters, this artifact deals 2 damage to that land's controller."
Murasa Ranger72%
$0.07↓#26866↓0.40↑10.9 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%
$0.20↓#2595↑0.2716.9 years↑
"Whenever a creature an opponent controls enters, you may have that player lose 1 life."
Spectrum Sentinel71%
$0.71↑#5940↓0.10↓3.8 years↓
"Whenever a nonbasic land an opponent controls enters, you gain 1 life."
Invader Parasite70%
$0.22↓#19796↓0.82↑15.3 years↑
"Whenever a land an opponent controls with the same name as the exiled card enters, this creature deals 2 damage to that player."
Undergrowth Champion70%
$0.38↑#8301↓0.42↑10.9 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Tunnel Ignus70%
$0.55↑#18263↓0.40↑15.9 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."