Undergrowth Champion 
Creature — Elemental
$0.38 #8504 0.00 11.0 years
If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from this creature.
Landfall — Whenever a land you control enters, put a +1/+1 counter on this creature.
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Cards similar to Undergrowth Champion 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.
Ugin's Conjurant98%
$0.16↓#11908↓0.077.5 years↓
"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from this creature."
+1 more matching line
Phantom Nantuko98%
$0.21↓#17191↓0.11↑24.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Phantom Wurm97%
$0.13↓#23839↓0.12↑20.0 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Phantom Tiger97%
$0.11↓#23451↓0.0024.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Phantom Nomad97%
$0.24↓#26712↓0.0024.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Phantom Flock97%
$0.04↓#23361↓0.0024.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Protean Hydra96%
$4.24↑#6637↑0.52↑17.3 years↑
"If damage would be dealt to this creature, prevent that damage and remove that many +1/+1 counters from it."
+1 more matching line
Oathsworn Knight96%
$0.19↓#19708↓0.20↑7.0 years↓
"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from it."
Phantom Centaur95%
$0.15↓#27284↓0.17↑24.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Rock Hydra95%
$1.00↑#27908↓0.62↑33.2 years↑
"For each 1 damage that would be dealt to this creature, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage."
+1 more matching line
Unbreathing Horde92%
$0.27↓#83180.19↑15.1 years↑
"If this creature would be dealt damage, prevent that damage and remove a +1/+1 counter from it."
Phantom Nishoba90%
$0.25↓#14448↓0.0624.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
Vinelasher Kudzu90%
$0.35↓#13535↓0.0021.0 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Territorial Scythecat90%
$0.16↓#81090.24↑6.1 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Prowling Felidar90%
$0.17↓#14289↓0.20↑6.1 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Sazh's Chocobo90%
$0.51↑#2990↑0.44↑1.4 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Polukranos, Unchained86%
$0.74↑#12145↓0.12↑6.7 years↓
"If damage would be dealt to this card while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from it."
Bloatfly Swarm86%
$1.73↑#5401↑0.73↑2.6 years↓
"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage, remove that many +1/+1 counters from it, then give each player a rad counter for each +1/+1 counter removed this way."
Murasa Ranger86%
$0.08↓#27217↓0.0011.0 years
"Whenever a land you control enters, you may pay 
. If you do, put two +1/+1 counters on this creature."
. If you do, put two +1/+1 counters on this creature."
Sekki, Seasons' Guide84%
$1.59↑#18616↓0.24↑21.4 years↑
"If damage would be dealt to this card, prevent that damage, remove that many +1/+1 counters from this card, and create that many 1/1 colorless Spirit creature tokens."