Volrath, the Shapestealer 



Legendary Creature — Phyrexian Shapeshifter
$0.67 #13791 0.22 7.2 years
At the beginning of combat on your turn, put a -1/-1 counter on up to one target creature.
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Cards similar to Volrath, the Shapestealer 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.
Cryptoplasm82%
$0.64↓#129380.44↑15.7 years↑
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Cultbrand Cinder82%
$0.11↓#30659↓0.00↓18.5 years↑
"When this creature enters, put a -1/-1 counter on target creature."
Skinrender82%
$0.23↓#5692↑0.69↑16.1 years↑
"When this creature enters, put three -1/-1 counters on target creature."
Cephalid Facetaker82%
$4.08↑#6963↑0.224.5 years↓
"At the beginning of combat on your turn, you may have this creature become a copy of another target creature until end of turn, except it's 1/4 and has "This creature can't be blocked.""
Weed-Pruner Poplar80%
$0.14↓#26750↓0.12↓18.7 years↑
"At the beginning of your upkeep, target creature other than this creature gets -1/-1 until end of turn."
Mimeoplasm, Revered One78%
$0.31↓#141960.291.7 years↓
"
: this card becomes a copy of target creature card exiled with it, except it's 0/0 and has this ability."
Hapatra, Vizier of Poisons77%
$0.26↓#3862↑0.34↑9.5 years↑
"Whenever this card deals combat damage to a player, you may put a -1/-1 counter on target creature."
Serrated Biskelion77%
$0.12↓#20345↓0.1829.4 years↑
"
: Put a -1/-1 counter on this creature and a -1/-1 counter on target creature."
Blowfly Infestation77%
$0.33↓#3048↑0.59↑18.5 years↑
"Whenever a creature dies, if it had a -1/-1 counter on it, put a -1/-1 counter on target creature."
Grim Affliction76%
$0.28↓#4567↑0.3015.4 years↑
"Put a -1/-1 counter on target creature, then proliferate."
Contagion Clasp76%
$0.34↓#1416↑0.2916.1 years↑
"When this artifact enters, put a -1/-1 counter on target creature."
Trigon of Corruption76%
$0.18↓#24745↓0.10↓16.1 years↑
"
,
, Remove a charge counter from this artifact: Put a -1/-1 counter on target creature."
Banewhip Punisher76%
$0.25↓#111920.06↓9.3 years↑
"When this creature enters, you may put a -1/-1 counter on target creature."
Liliana, Death Wielder75%
$0.39↓#7854↑0.07↓9.5 years↑
"+2: Put a -1/-1 counter on up to one target creature."