Bloodhall Ooze 
Creature — Ooze
$0.52 #21493 0.07 17.6 years
At the beginning of your upkeep, if you control a black permanent, you may put a +1/+1 counter on this creature.
At the beginning of your upkeep, if you control a green permanent, you may put a +1/+1 counter on this creature.
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Cards similar to Bloodhall Ooze 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.
Reverent Hunter89%
$0.21↓#190250.0012.9 years↓
"When this creature enters, put a number of +1/+1 counters on it equal to your devotion to green."
Ashenmoor Cohort84%
$0.14↓#31312↓0.27↑18.3 years
"This creature gets +1/+1 as long as you control another black creature."
Ring of Kalonia82%
$0.40↓#8950↑0.33↑14.1 years↓
"At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's green."
Crabapple Cohort81%
$0.08↓#29591↓0.1618.3 years
"This creature gets +1/+1 as long as you control another green creature."
Ring of Xathrid80%
$0.51↓#6851↑0.0614.1 years↓
"At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's black."
Purraj of Urborg79%
$0.88↑#28511↓0.25↑29.9 years↑
"Whenever a player casts a black spell, you may pay 
. If you do, put a +1/+1 counter on Purraj."
. If you do, put a +1/+1 counter on Purraj."
Rushwood Elemental78%
$0.98↑#28048↓0.25↑26.9 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Mountain Titan78%
$0.59↑#31691↓0.0731.3 years↑
"
: Until end of turn, whenever you cast a black spell, put a +1/+1 counter on this creature."
: Until end of turn, whenever you cast a black spell, put a +1/+1 counter on this creature."
Yorvo, Lord of Garenbrig78%
$0.38↓#9364↑0.40↑6.9 years↓
"Whenever another green creature you control enters, put a +1/+1 counter on this card. Then if that creature's power is greater than this card's power, put another +1/+1 counter on this card."
+1 more matching line
K'rrik, Son of Yawgmoth77%
$0.86↑#1071↑1.28↑7.0 years↓
"Whenever you cast a black spell, put a +1/+1 counter on this card."
Oran-Rief, the Vastwood77%
$0.39↓#727↑0.19↑16.9 years
"
: Put a +1/+1 counter on each green creature that entered this turn."
: Put a +1/+1 counter on each green creature that entered this turn."
Titania's Chosen75%
$0.31↓#17141↑0.0627.9 years↑
"Whenever a player casts a green spell, put a +1/+1 counter on this creature."
Ivy Lane Denizen74%
$0.24↓#2460↑0.19↑13.6 years↓
"Whenever another green creature you control enters, put a +1/+1 counter on target creature."
Quirion Dryad74%
$0.10↓#250140.35↑25.6 years↑
"Whenever you cast a spell that's white, blue, black, or red, put a +1/+1 counter on this creature."
Child of the Volcano74%
$0.10↓#228350.46↑2.8 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Noxious Hatchling72%
$0.39↓#199990.27↑18.1 years
"Whenever you cast a black spell, remove a -1/-1 counter from this creature."
+1 more matching line
Air Nomad Student72%
$0.17↓#248100.000.8 years↓
"At the beginning of your end step, if this creature didn't attack this turn, put a +1/+1 counter on it."
Deep Goblin Skulltaker72%
$0.18↓#186870.002.8 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Defiler of Vigor72%
$2.73↑#1605↑0.37↑4.0 years↓
"Whenever you cast a green permanent spell, put a +1/+1 counter on each creature you control."
Chronomaton72%
$0.18↓#16727↑0.0014.1 years↓
", : Put a +1/+1 counter on this creature."
, : Put a +1/+1 counter on this creature."