Contagion Engine 
Artifact
$12.59 #1854 0.74 16.1 years
When this artifact enters, put a -1/-1 counter on each creature target player controls.
, 
: Proliferate twice. (Choose any number of permanents and/or players, then give each another counter of each kind already there. Then do it again.)Click a line or tag to filter
Cards similar to Contagion Engine 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.
Contagion Clasp95%
$0.34↓#1416↑0.29↓16.1 years
", : Proliferate."
, : Proliferate."+1 more matching line
Soul Snuffers86%
$0.26↓#4957↓0.56↓18.2 years↑
"When this creature enters, put a -1/-1 counter on each creature."
Karn's Bastion86%
$2.77↓#206↑0.23↓7.5 years↓
", : Proliferate."
, : Proliferate."
Viral Drake84%
$0.64↓#7164↓0.6815.4 years
"
: Proliferate."
: Proliferate."
Skinrender84%
$0.23↓#5692↓0.6916.1 years
"When this creature enters, put three -1/-1 counters on target creature."
Cultbrand Cinder84%
$0.11↓#30659↓0.00↓18.5 years↑
"When this creature enters, put a -1/-1 counter on target creature."
Merfolk Skydiver82%
$0.26↓#6733↓0.06↓7.5 years↓
"
: Proliferate."
: Proliferate."
Harbinger of Night82%
$24.09↑#14367↓1.29↑30.0 years↑
"At the beginning of your upkeep, put a -1/-1 counter on each creature."
Blight Rot80%
$0.28↓#8917↓0.04↓0.7 years↓
"Put four -1/-1 counters on target creature."
Scar78%
$0.23↓#19802↓0.19↓18.5 years↑
"Put a -1/-1 counter on target creature."
Darkness Descends78%
$0.26↓#10057↓0.37↓0.7 years↓
"Put two -1/-1 counters on each creature."
Lulu, Stern Guardian77%
$0.30↓#3421↓0.651.4 years↓
": Proliferate."
: Proliferate."
Banewhip Punisher76%
$0.25↓#11192↓0.06↓9.3 years↓
"When this creature enters, you may put a -1/-1 counter on target creature."
Instill Infection76%
$0.09↓#24167↓0.35↓16.1 years
"Put a -1/-1 counter on target creature."
Pith Driller74%
$0.15↓#28174↓0.28↓15.4 years
"When this creature enters, put a -1/-1 counter on target creature."
Hapatra, the Desert Fang74%
$0.18↓#23843↓0.28↓0.0 years↓
"When this card enters, for each opponent, put X -1/-1 counters on up to one target creature that player controls, where X is the greatest mana value among cards in your graveyard."
Grim Affliction74%
$0.28↓#4567↓0.30↓15.4 years
"Put a -1/-1 counter on target creature, then proliferate."
Cartouche of Ambition74%
$0.14↓#15685↓0.25↓9.5 years↓
"When this Aura enters, you may put a -1/-1 counter on target creature."
Splendid Agony74%
$0.20↓#15437↓0.11↓9.5 years↓
"Distribute two -1/-1 counters among one or two target creatures."
Eyeblight Assassin73%
$0.09↓#22239↓0.06↓11.3 years↓
"When this creature enters, target creature an opponent controls gets -1/-1 until end of turn."