Guiding Hydra 

Creature — Hydra Horror
$0.43 #16361 0.16 0.0 years
This creature enters with X +1/+1 counters on it.
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.
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Cards similar to Guiding Hydra 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.
Salt Road Quartermasters96%
$0.05↓#29352↓0.31↑11.6 years↑
"This creature enters with two +1/+1 counters on it."
Spike Colony96%
$0.05↓#28340↓0.00↓28.6 years↑
"This creature enters with four +1/+1 counters on it."
Mikaeus, the Lunarch95%
$0.49↑#2007↑0.26↑15.2 years↑
"
, Remove a +1/+1 counter from this card: Put a +1/+1 counter on each other creature you control."
+1 more matching line
Spike Soldier95%
$0.20↓#28291↓0.06↓28.6 years↑
"This creature enters with three +1/+1 counters on it."
Spike Tiller94%
$0.34↓#28133↓0.00↓20.0 years↑
"This creature enters with three +1/+1 counters on it."
Spike Breeder92%
$0.35↓#27141↓0.06↓28.6 years↑
"This creature enters with three +1/+1 counters on it."
Generous Pup92%
$8.83↑#5299↑0.141.9 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."
Spitting Hydra90%
$0.40↓#31133↓0.0728.6 years↑
"This creature enters with four +1/+1 counters on it."
Spike Weaver90%
$0.73↑#10247↑0.1228.3 years↑
"This creature enters with three +1/+1 counters on it."
Victory's Envoy90%
$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."