Chaotic Goo 
Creature — Ooze
$1.26 #15163 0.07 28.9 years
This creature enters with three +1/+1 counters on it.
At the beginning of your upkeep, you may flip a coin. If you win the flip, put a +1/+1 counter on this creature. If you lose the flip, remove a +1/+1 counter from this creature.
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Cards similar to Chaotic Goo 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.
Crazed Firecat94%
$0.28↓#18295↓0.47↑24.6 years↓
"When this creature enters, flip a coin until you lose a flip. Put a +1/+1 counter on this creature for each flip you won."
Rushwood Elemental84%
$0.98↓#28048↓0.25↑26.9 years↓
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Savage Firecat82%
$0.28↓#30772↓0.24↑24.9 years↓
"This creature enters with seven +1/+1 counters on it."
Air Nomad Student78%
$0.17↓#24810↓0.000.8 years↓
"At the beginning of your end step, if this creature didn't attack this turn, put a +1/+1 counter on it."
Goblin Bomb78%
$16.14↑#125380.70↑29.2 years
"At the beginning of your upkeep, you may flip a coin. If you win the flip, put a fuse counter on this enchantment. If you lose the flip, remove a fuse counter from this enchantment."
Chronomaton78%
$0.18↓#167270.0014.1 years↓
"
, 
: Put a +1/+1 counter on this creature."
, : Put a +1/+1 counter on this creature."
Hungry Megasloth78%
$0.18↓#26462↓0.121.8 years↓
", : Put a +1/+1 counter on this creature."
, : Put a +1/+1 counter on this creature."
Energizer78%
$0.33↓#30268↓0.0028.9 years
", : Put a +1/+1 counter on this creature."
, : Put a +1/+1 counter on this creature."
Child of the Volcano78%
$0.10↓#22835↓0.46↑2.8 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Big Bertha76%
$0.28↓#24155↓0.000.2 years↓
"this card enters with X +1/+1 counters on her."
Savageborn Hydra76%
$0.46↓#11456↑0.31↑13.3 years↓
"This creature enters with X +1/+1 counters on it."
Deep Goblin Skulltaker76%
$0.18↓#18687↓0.002.8 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Chlorophant74%
$0.50↓#27900↓0.0024.9 years↓
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Knight of Wundagore74%
$0.09↓#21078↓0.000.2 years↓
"Whenever you put a +1/+1 counter on another creature, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Botanical Brawler74%
$0.32↓#6758↑0.27↑3.4 years↓
"Whenever one or more +1/+1 counters are put on another permanent you control, if it's the first time +1/+1 counters have been put on that permanent this turn, put a +1/+1 counter on this creature."
+1 more matching line
Skittish Valesk74%
$0.21↓#27574↓0.29↑23.9 years↓
"At the beginning of your upkeep, flip a coin. If you lose the flip, turn this creature face down."
Vebulid73%
$0.69↓#26183↓0.0027.9 years
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
+1 more matching line
Fairgrounds Trumpeter73%
$0.10↓#19573↓0.53↑9.9 years↓
"At the beginning of each end step, if a +1/+1 counter was put on a permanent under your control this turn, put a +1/+1 counter on this creature."
Enduring Scalelord73%
$0.13↓#11165↑0.20↑11.4 years↓
"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."
Myr Prototype72%
$0.16↓#23265↓0.50↑22.9 years↓
"At the beginning of your upkeep, put a +1/+1 counter on this creature."