Ouroboroid 
Creature — Plant Wurm
$34.16 #1642 0.63 1.1 years
At the beginning of combat on your turn, put X +1/+1 counters on each creature you control, where X is this creature's power.
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Cards similar to Ouroboroid 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.
Brambleguard Captain86%
$0.18↓#11699↓0.19↓2.1 years
"At the beginning of combat on your turn, target creature you control gets +X/+0 until end of turn, where X is this creature's power."
Heroes' Bane85%
$0.15↓#7891↓0.14↓12.4 years↑
": Put X +1/+1 counters on this creature, where X is its power."
: Put X +1/+1 counters on this creature, where X is its power."
Victory's Envoy82%
$0.34↓#9885↓0.00↓6.6 years↑
"At the beginning of your upkeep, put a +1/+1 counter on each other creature you control."
Rampaging Aetherhood81%
$0.29↓#8572↓0.16↓1.6 years
"At the beginning of your upkeep, you get an amount of 
equal to this creature's power. Then you may pay one or more . If you do, put that many +1/+1 counters on this creature."
equal to this creature's power. Then you may pay one or more . If you do, put that many +1/+1 counters on this creature."
Devilish Valet80%
$0.33↓#3426↓0.38↓4.4 years↑
"Whenever another creature you control enters, double this creature's power until end of turn."
Unnatural Growth78%
$2.25↓#444↑0.584.9 years↑
"At the beginning of each combat, double the power and toughness of each creature you control until end of turn."
Generous Pup78%
$7.08↓#5565↓0.17↓1.8 years
"Whenever one or more +1/+1 counters are put on this creature, put a +1/+1 counter on each other creature you control. This ability triggers only once each turn."
Web-Warriors76%
$0.30↓#9548↓0.24↓1.0 years
"When this creature enters, put a +1/+1 counter on each other creature you control."
Ridgescale Tusker76%
$0.10↓#17601↓0.00↓9.6 years↑
"When this creature enters, put a +1/+1 counter on each other creature you control."
Supply Runners76%
$0.16↓#13665↓0.00↓6.1 years↑
"When this creature enters, put a +1/+1 counter on each other creature you control."
Halana and Alena, Partners76%
$0.21↓#1998↓0.29↓4.8 years↑
"At the beginning of combat on your turn, put X +1/+1 counters on another target creature you control, where X is this card's power. That creature gains haste until end of turn."
Railway Brawler76%
$5.84↓#2492↓0.36↓2.4 years↑
"Whenever another creature you control enters, put X +1/+1 counters on it, where X is its power."
Soul's Might76%
$0.09↓#14179↓0.20↓17.9 years↑
"Put X +1/+1 counters on target creature, where X is that creature's power."
Maester Seymour75%
$0.27↓#3744↓0.37↓1.2 years
"At the beginning of combat on your turn, put a number of +1/+1 counters equal to this card's power on another target creature you control."
The Falcon, Sam Wilson75%
$0.30↓#26028↓0.00↓0.2 years
"When this card enters, put a +1/+1 counter on each other creature you control."
Basri's Solidarity75%
$0.11↓#10279↓0.19↓6.2 years↑
"Put a +1/+1 counter on each creature you control."
Inspiring Roar75%
$0.06↓#18520↓0.609.6 years↑
"Put a +1/+1 counter on each creature you control."
War Machine, Legacy of Iron74%
$0.17↓#21792↓0.00↓0.2 years
"At the beginning of combat on your turn, another target creature you control gets +X/+0 until end of turn, where X is this card's power."
Wild Beastmaster74%
$0.22↓#8469↓0.10↓13.9 years↑
"Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power."
Strength of the Pack74%
$0.09↓#18783↓0.24↓8.6 years↑
"Put two +1/+1 counters on each creature you control."