Titans' Vanguard 


Creature — Eldrazi
Devoid (This card has no color.)
When you cast this spell and whenever this creature attacks, put a +1/+1 counter on each colorless creature you control.
Trample
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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.
Rubblebelt Raiders 89%
$0.13#17880
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Fangren Firstborn 87%
$2.46#15366
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Oran-Rief Ooze 85%
$0.26#8026
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it."
Bounding Felidar 83%
$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."
Kalonian Hydra 82%
$5.82#1096
"Whenever this creature attacks, double the number of +1/+1 counters on each creature you control."
+1 more matching line
Gideon, the Oathsworn 81%
#17669
"Whenever you attack with two or more non-this card creatures, put a +1/+1 counter on each of those creatures."
Invasion of New Capenna // Holy Frazzle-Cannon 80%
$0.21#9308
"Whenever equipped creature attacks, put a +1/+1 counter on that creature and each other creature you control that shares a creature type with it."
Makeshift Battalion 80%
$0.13#22067
"Whenever this creature and at least two other creatures attack, put a +1/+1 counter on this creature."