Pith Driller 
Artifact Creature — Phyrexian Horror
$0.16 #27874 0.28 15.3 years
( can be paid with either 
or 2 life.)
can be paid with either or 2 life.)When this creature enters, put a -1/-1 counter on target creature.
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Cards similar to Pith Driller 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.
Cultbrand Cinder90%
$0.11↓#302990.00↓18.3 years↑
"When this creature enters, put a -1/-1 counter on target creature."
Skinrender90%
$0.17↑#5738↑0.40↑15.9 years
"When this creature enters, put three -1/-1 counters on target creature."
Dismember88%
$2.64↑#929↑0.3515.3 years
"Target creature gets -5/-5 until end of turn."
Scar86%
$0.23↑#19614↑0.2918.3 years↑
"Put a -1/-1 counter on target creature."
Blight Rot84%
$0.25↑#9217↑0.00↓0.6 years↓
"Put four -1/-1 counters on target creature."
Instill Infection82%
$0.11↓#237120.07↓15.9 years
"Put a -1/-1 counter on target creature."
Banewhip Punisher82%
$0.29↑#10977↑0.00↓9.1 years↓
"When this creature enters, you may put a -1/-1 counter on target creature."
Contagion Clasp81%
$0.34↑#1420↑0.3616.0 years
"When this artifact enters, put a -1/-1 counter on target creature."
Grim Affliction81%
$0.31↑#4601↑0.3315.3 years
"Put a -1/-1 counter on target creature, then proliferate."
Eyeblight Assassin80%
$0.07↓#21888↑0.3111.1 years↓
"When this creature enters, target creature an opponent controls gets -1/-1 until end of turn."
Blister Beetle80%
$0.05↓#246290.2917.9 years↑
"When this creature enters, target creature gets -1/-1 until end of turn."
Cartouche of Ambition80%
$0.14↓#15437↑0.06↓9.4 years↓
"When this Aura enters, you may put a -1/-1 counter on target creature."
Farbog Boneflinger80%
$0.06↓#307160.2914.6 years
"When this creature enters, target creature gets -2/-2 until end of turn."
Fourth Bridge Prowler79%
$0.21↑#14512↑0.00↓9.6 years↓
"When this creature enters, you may have target creature get -1/-1 until end of turn."
Soul Snuffers79%
$0.27↑#5038↑0.2118.1 years↑
"When this creature enters, put a -1/-1 counter on each creature."
Keening Banshee78%
$0.12↓#273080.00↓21.0 years↑
"When this creature enters, target creature gets -2/-2 until end of turn."
Skulking Killer78%
$0.10↓#252650.00↓4.8 years↓
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn if that opponent controls no other creatures."
Gnarled Effigy78%
$0.18↑#274880.2418.3 years↑
", 
: Put a -1/-1 counter on target creature."
, : Put a -1/-1 counter on target creature."
Ambush Gigapede77%
$0.12↓#20338↑0.00↓2.4 years↓
"When this creature enters, target creature an opponent controls gets -2/-2 until end of turn."
Fume Spitter77%
$0.18↑#10859↑0.05↓15.9 years
"Sacrifice this creature: Put a -1/-1 counter on target creature."