Warden of the Grove 

Creature — Hydra
$1.60 #2265 0.19 1.4 years
At the beginning of your end step, put a +1/+1 counter on this creature.
Whenever another nontoken creature you control enters, it endures X, where X is the number of counters on this creature. (Put X +1/+1 counters on the creature that entered or create an X/X white Spirit creature token.)
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Cards similar to Warden of the Grove 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.
Mighty Mutanimals88%
$0.15↓#16852↓0.00↓0.5 years
"Whenever another creature you control enters, put a +1/+1 counter on target creature you control."
Juniper Order Ranger88%
$0.15↓#7980↓0.00↓21.0 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature."
Good-Fortune Unicorn84%
$0.20↓#3509↓0.177.2 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
EPF Point Squad84%
$0.09↓#22564↓0.00↓0.5 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Celebrity Fencer84%
$0.17↓#18387↓0.234.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Rushwood Elemental82%
$0.98↓#28048↓0.2526.9 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Scurry Oak79%
$2.37↑#22590.54↑5.2 years↑
"Whenever one or more +1/+1 counters are put on this creature, you may create a 1/1 green Squirrel creature token."
Stalwart Successor78%
$0.20↓#13596↓0.07↓1.4 years
"Whenever one or more counters are put on a creature you control, if it's the first time counters have been put on that creature this turn, put a +1/+1 counter on that creature."
Air Nomad Student78%
$0.17↓#24810↓0.00↓0.8 years
"At the beginning of your end step, if this creature didn't attack this turn, put a +1/+1 counter on it."
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."
Boss's Chauffeur78%
$0.19↓#6475↓0.144.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Skyknight Squire78%
$0.47↓#5146↓0.161.8 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Fairgrounds Trumpeter77%
$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."
Knight of Wundagore77%
$0.09↓#21078↓0.00↓0.2 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."
Deep Goblin Skulltaker77%
$0.18↓#18687↓0.00↓2.8 years↑
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Swarm Shambler77%
$0.19↓#15078↓0.265.9 years↑
"
,
: Put a +1/+1 counter on this creature."
+1 more matching line
Enduring Scalelord76%
$0.13↓#11165↓0.2011.4 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."
Botanical Brawler76%
$0.32↓#6758↓0.273.4 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."