Herald of War 
Creature — Angel
$2.53 #3161 0.30 14.3 years
Flying
Whenever this creature attacks, put a +1/+1 counter on it.
Angel spells and Human spells you cast cost 
less to cast for each +1/+1 counter on this creature.
less to cast for each +1/+1 counter on this creature.Click a line or tag to filter
Cards similar to Herald of War 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.
Starnheim Aspirant84%
$9.02↑#31500.255.6 years↓
"Angel spells you cast cost 
less to cast."
less to cast."
Righteous Valkyrie81%
$5.40↑#2027↑0.295.6 years↓
"Flying"
Ezio, Brash Novice78%
$0.19↓#12528↓0.76↑2.2 years↓
"Whenever this card attacks, put a +1/+1 counter on it."
Resplendent Griffin78%
$0.13↓#28436↓0.00↓8.6 years↓
"Whenever this creature attacks, if you have the city's blessing, put a +1/+1 counter on it."
Casey Jones, Back Alley Brute78%
$0.31↓#7643↓0.00↓0.5 years↓
"Whenever this card attacks, put a +1/+1 counter on target attacking creature."
+1 more matching line
Rubblebelt Raiders77%
$0.13↓#18440↓0.3113.6 years
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
The Ur-Dragon77%
$35.73↑#26221.97↑9.0 years↓
"Flying"
Scavenger Drake77%
$0.18↓#22233↓0.40↑17.9 years↑
"Flying"
Big Mother Mouser76%
$2.05↓#5279↓0.00↓0.5 years↓
"Whenever this creature attacks, double the number of +1/+1 counters on it."
Kilnmouth Dragon76%
$0.73↓#17391↓0.2723.6 years↑
"Flying"
Umara Raptor76%
$0.14↓#17940↓0.00↓16.9 years↑
"Flying"
Oran-Rief Ooze76%
$0.30↓#7852↓0.56↑5.9 years↓
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it."
Enduring Scalelord76%
$0.13↓#11165↓0.2011.4 years↓
"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."
+1 more matching line
Aven Sunstriker76%
$0.24↓#17715↓0.00↓11.4 years↓
"Flying"
Untethered Express75%
$0.23↓#12955↓0.00↓9.6 years↓
"Whenever this Vehicle attacks, put a +1/+1 counter on it."
Knight of Wundagore75%
$0.09↓#21078↓0.00↓0.2 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."
Air Nomad Student74%
$0.17↓#24810↓0.00↓0.8 years↓
"At the beginning of your end step, if this creature didn't attack this turn, put a +1/+1 counter on it."
Fangren Firstborn74%
$2.32↓#15553↓0.17↓22.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Botanical Brawler74%
$0.32↓#6758↓0.273.4 years↓
"Whenever one or more +1/+1 counters are put on another permanent you control, if it's the first time +1/+1 counters have been put on that permanent this turn, put a +1/+1 counter on this creature."
Bladed Bracers74%
$0.11↓#17779↓0.00↓14.3 years
"As long as equipped creature is a Human or an Angel, it has vigilance."