Briar Hydra 
Creature — Plant Hydra
$0.30 #12871 0.38 4.0 years
Trample
Domain — Whenever this creature deals combat damage to a player, put X +1/+1 counters on target creature you control, where X is the number of basic land types among lands you control.
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Cards similar to Briar 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.
Falkenrath Marauders89%
$0.26↓#16087↓0.20↓14.9 years↑
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
Markov Blademaster89%
$0.30#134650.10↓14.6 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper89%
$0.21↓#25520↓0.06↓14.6 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol89%
$0.08↓#27363↓0.27↓14.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Predator89%
$0.11↓#28916↓0.00↓22.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker89%
$0.10↓#28099↓0.24↓22.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Heirs of Stromkirk88%
$0.13↓#23805↓0.25↓14.3 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant88%
$0.09↓#25038↓0.2922.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Havengul Vampire87%
$0.14↓#21336↓0.25↓14.3 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Necropolis Regent85%
$0.40↑#4062↑0.21↓13.9 years↑
"Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it."
Slith Bloodletter84%
$0.12↓#29555↓0.25↓22.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Sphere Grid83%
$8.73↑#1299↑0.461.2 years↓
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
Curse of Stalked Prey83%
$0.85↑#123940.26↓14.9 years↑
"Whenever a creature deals combat damage to enchanted player, put a +1/+1 counter on that creature."
Bloodcrazed Neonate82%
$0.09↓#22630↓0.17↓14.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Guild Thief82%
$0.05↓#22872↓0.25↓5.1 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Thunderwolf Cavalry82%
$0.35↑#152570.383.9 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on each other creature you control."
Bejeweled Warg82%
$0.39↑#16401↓0.00↓0.1 years↓
"Trample"
Borborygmos82%
$0.37↑#17178↓0.3120.6 years↑
"Whenever this card deals combat damage to a player, put a +1/+1 counter on each creature you control."
+1 more matching line
Cazur, Ruthless Stalker82%
$0.37↑#8181↑0.11↓6.4 years↑
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
Drana, Liberator of Malakir82%
$0.88↑#1521↑0.19↓10.9 years↑
"Whenever this card deals combat damage to a player, put a +1/+1 counter on each attacking creature you control."