Warden of the Grove 

Creature — Hydra
$1.58 #2192 0.25 1.5 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?
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Mighty Mutanimals90%
$0.19↓#16427↓0.260.6 years
"Whenever another creature you control enters, put a +1/+1 counter on target creature you control."
Juniper Order Ranger87%
$0.15↓#8248↓0.1821.2 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%
$0.28↓#3546↓0.15↓7.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Celebrity Fencer84%
$0.20↓#18796↓0.00↓4.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
EPF Point Squad84%
$0.07↓#22367↓0.170.6 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Stalwart Successor82%
$0.19↓#13649↓0.201.5 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."
Rushwood Elemental81%
$1.04↓#28334↓0.00↓27.0 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Mabel, Valley Hero80%
$0.20↓#21925↓0.09↓0.0 years↓
"Whenever this card or another creature you control enters, put a +1/+1 counter on target creature that entered this turn."
Anafenza, Kin-Tree Spirit79%
$0.26↓#6085↓0.06↓11.6 years↑
"Whenever another nontoken creature you control enters, bolster 1."
Scurry Oak78%
$2.64↑#22820.55↑5.3 years↑
"Whenever one or more +1/+1 counters are put on this creature, you may create a 1/1 green Squirrel creature token."
Child of the Volcano78%
$0.12↓#23322↓0.06↓2.9 years↑
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Boss's Chauffeur78%
$0.26↓#6650↓0.06↓4.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Air Nomad Student78%
$0.17↓#24735↓0.09↓0.9 years
"At the beginning of your end step, if this creature didn't attack this turn, put a +1/+1 counter on it."
Skyknight Squire78%
$0.39↓#5062↓0.06↓1.9 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Fairgrounds Trumpeter76%
$0.09↓#19957↓0.00↓10.1 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 Wundagore76%
$0.08↓#19783↓0.11↓0.3 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 Skulltaker76%
$0.15↓#19093↓0.00↓2.9 years↑
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Swarm Shambler76%
$0.19↓#15392↓0.07↓6.1 years↑
"
,
: Put a +1/+1 counter on this creature."
+1 more matching line
Paradox Zone76%
$1.30↓#10208↓0.225.5 years↑
"At the beginning of your end step, double the number of growth counters on this enchantment. Then create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of growth counters on this enchantment."