Sisterhood of Karn 
Creature — Cleric
$0.23 #12410 0.37 3.0 years
This creature enters with a +1/+1 counter on it.
Paradox — Whenever you cast a spell from anywhere other than your hand, double the number of +1/+1 counters on this creature.
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Cards similar to Sisterhood of Karn 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.
Lily Bowen, Raging Grandma94%
$0.46↑#7080↑0.25↓2.6 years
"this card enters with two +1/+1 counters on it."
Mossborn Hydra92%
$13.45↑#747↑0.95↑1.9 years↓
"This creature enters with a +1/+1 counter on it."
Prairie Dog88%
$0.23#23266↓0.00↓2.5 years
"At the beginning of your end step, if you haven't cast a spell from your hand this turn, put a +1/+1 counter on this creature."
Ascendant Acolyte86%
$0.32↑#112860.294.7 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Primordial Hydra84%
$1.37↑#2429↑0.55↑15.3 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on this creature."
+1 more matching line
Kinetic Ooze80%
$0.33↑#7000↑0.330.5 years↓
"This creature enters with X +1/+1 counters on it."
Hulk, Strongest There Is80%
$0.92↑#15836↓0.470.3 years↓
"this card enters with a +1/+1 counter on him."
The Thirteenth Doctor78%
$0.21↓#5155↑0.62↑3.0 years
"Whenever you cast a spell from anywhere other than your hand, put a +1/+1 counter on target creature."
Rampaging Monument78%
$0.15↓#24535↓0.00↓8.0 years↑
"Whenever you cast a multicolored spell, put a +1/+1 counter on this creature."
+1 more matching line
Swarm Shambler78%
$0.19↓#15392↓0.07↓6.1 years↑
"This creature enters with a +1/+1 counter on it."
Benevolent Hydra78%
$0.74↑#2938↑0.313.9 years
"This creature enters with X +1/+1 counters on it."
Maga, Traitor to Mortals78%
$3.10↑#20494↓0.50↑21.4 years↑
"this card enters with X +1/+1 counters on it."
Slurrk, All-Ingesting78%
$0.29↑#9684↑0.11↓5.9 years↑
"this card enters with five +1/+1 counters on it."
Sage of the Fang78%
$0.19↓#146070.07↓1.5 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Diamond Knight78%
$0.30↑#15130↓0.11↓7.3 years↑
"Whenever you cast a spell of the chosen color, put a +1/+1 counter on this creature."
Grakmaw, Skyclave Ravager78%
$0.35↑#103330.26↓6.1 years↑
"this card enters with three +1/+1 counters on it."
Fractal Harness78%
$0.25↑#6379↑0.295.5 years↑
"When this Equipment enters, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it and attach this Equipment to it."
Solarion77%
$0.63↑#22379↓0.21↓22.4 years↑
"
: Double the number of +1/+1 counters on this creature."
: Double the number of +1/+1 counters on this creature."
Savageborn Hydra76%
$0.45↑#117400.12↓13.5 years↑
"This creature enters with X +1/+1 counters on it."
Marketback Walker76%
$0.38↑#3959↑0.23↓1.7 years↓
"This creature enters with X +1/+1 counters on it."