Ouroboroid 
Creature — Plant Wurm
$33.75 #1535 1.33 1.2 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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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%
$0.20↓#11924↓0.05↓2.2 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' Bane86%
$0.17↓#7980↓0.19↓12.5 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."
Rampaging Aetherhood82%
$0.27↓#8459↓0.12↓1.7 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."
Victory's Envoy81%
$0.32↓#10210↓0.44↓6.7 years↑
"At the beginning of your upkeep, put a +1/+1 counter on each other creature you control."
Guiding Hydra79%
$0.43↓#16361↓0.16↓0.0 years↓
"At the beginning of combat on your turn, you may remove a +1/+1 counter from this creature. If you do, put a +1/+1 counter on each other creature you control."
Devilish Valet79%
$0.32↓#3519↓0.24↓4.5 years↑
"Whenever another creature you control enters, double this creature's power until end of turn."
Unnatural Growth78%
$1.49↓#437↑0.64↓5.1 years↑
"At the beginning of each combat, double the power and toughness of each creature you control until end of turn."
Generous Pup76%
$8.83↓#5299↓0.14↓1.9 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."
Maester Seymour76%
$0.26↓#3593↓0.29↓1.4 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."
Loyal Guardian76%
$0.23↓#3104↓0.17↓8.2 years↑
"At the beginning of combat on your turn, if you control your commander, put a +1/+1 counter on each creature you control."
Prime Speaker Zegana76%
$0.19↓#2859↓0.21↓13.7 years↑
"this card enters with X +1/+1 counters on it, where X is the greatest power among other creatures you control."
Ridgescale Tusker76%
$0.11↓#17785↓0.06↓9.7 years↑
"When this creature enters, put a +1/+1 counter on each other creature you control."
Supply Runners76%
$0.18↓#13859↓0.00↓6.3 years↑
"When this creature enters, put a +1/+1 counter on each other creature you control."
Web-Warriors76%
$0.23↓#9373↓0.20↓1.1 years
"When this creature enters, put a +1/+1 counter on each other creature you control."
Halana and Alena, Partners75%
$0.39↓#2025↓0.30↓4.9 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."
Experiment Twelve75%
$0.33↓#8293↓0.00↓2.7 years↑
"Whenever this creature or another creature you control is turned face up, put +1/+1 counters on that creature equal to its power."
Shelinda, Yevon Acolyte75%
$0.22↓#5407↓0.12↓1.4 years
"Whenever another creature you control enters, put a +1/+1 counter on that creature if its power is less than this card's power. Otherwise, put a +1/+1 counter on this card."
Soul's Might75%
$0.13↓#14459↓0.24↓18.0 years↑
"Put X +1/+1 counters on target creature, where X is that creature's power."
Railway Brawler74%
$5.81↓#2547↓0.36↓2.5 years↑
"Whenever another creature you control enters, put X +1/+1 counters on it, where X is its power."
The Falcon, Sam Wilson74%
$0.20↓#25207↓0.26↓0.3 years
"When this card enters, put a +1/+1 counter on each other creature you control."