Kalonian Hydra 


Creature — Hydra
Trample
This creature enters with four +1/+1 counters on it.
Whenever this creature attacks, double the number of +1/+1 counters on each creature you control.
click a line to search just that ability, click more to combine them
Cards that do something similar 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.
Bounding Felidar 84%
$0.18#10971
"Whenever this creature attacks while saddled, put a +1/+1 counter on each other creature you control. You gain 1 life for each of those creatures."
Oran-Rief Ooze 83%
$0.26#8026
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it."
Big Mother Mouser 82%
$2.07#6054
"Whenever this creature attacks, double the number of +1/+1 counters on it."
+1 more matching line
Titans' Vanguard 82%
$0.16#8020
"When you cast this spell and whenever this creature attacks, put a +1/+1 counter on each colorless creature you control."
Fangren Firstborn 81%
$2.46#15366
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Clockwork Vorrac 100%
$0.11#24569
"This creature enters with four +1/+1 counters on it."
+1 more matching line