Armory of Iroas 
Artifact — Equipment
$0.23 #8026 0.27 12.5 years
Whenever equipped creature attacks, put a +1/+1 counter on it.
Equip (: Attach to target creature you control. Equip only as a sorcery.)
(: Attach to target creature you control. Equip only as a sorcery.)Click a line or tag to filter
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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.
Bone Sabres100%
$4.79↑#6114↑0.07↓4.0 years↓
"Whenever equipped creature attacks, put four +1/+1 counters on it."
Greatsword of Tyr91%
$0.35↑#73990.224.4 years↓
"Whenever equipped creature attacks, put a +1/+1 counter on it and tap up to one target creature defending player controls."
Glowcap Lantern90%
$0.22↓#11644↓0.00↓2.9 years↓
"Equip "
"
Armasaur Guide88%
$0.09↓#17861↓0.06↓1.9 years↓
"Whenever you attack with three or more creatures, put a +1/+1 counter on target creature you control."
Gleam of Battle88%
$0.14↓#13930↓0.17↓13.5 years
"Whenever a creature you control attacks, put a +1/+1 counter on it."
Delver's Torch87%
$0.15↓#13491↓0.07↓5.2 years↓
"Whenever equipped creature attacks, venture into the dungeon."
Black Panther, Claws of Bast85%
$1.44↑#21263↓0.310.3 years↓
"Whenever a creature you control attacks alone, put a +1/+1 counter on it."
Surgical Suite // Hospital Room84%
$0.21↓#90860.07↓2.1 years↓
"Whenever you attack, put a +1/+1 counter on target attacking creature."
Curse of Predation84%
$0.19↓#14619↓0.3313.0 years
"Whenever a creature attacks enchanted player, put a +1/+1 counter on it."
Hunter's Axe84%
$0.27↑#21550↓0.14↓0.0 years↓
"Equip "
"
Sword of Hours83%
$5.43↑#5102↑0.00↓5.2 years↓
"Whenever equipped creature attacks, put a +1/+1 counter on it."
+1 more matching line
Iconic Shield83%
$0.21↓#24166↓0.200.3 years↓
"Equip 
"
"
Fire Nation Engineer82%
$0.06↓#17112↓0.12↓0.9 years↓
"At the beginning of your end step, if you attacked this turn, put a +1/+1 counter on another target creature or Vehicle you control."
Casey Jones, Back Alley Brute82%
$0.31↑#71790.320.6 years↓
"Whenever this card attacks, put a +1/+1 counter on target attacking creature."
Rubblebelt Raiders82%
$0.13↓#18863↓0.00↓13.7 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Fractal Harness82%
$0.25↑#6379↑0.295.5 years↓
"Whenever equipped creature attacks, double the number of +1/+1 counters on it."
+1 more matching line
Seismic Tutelage82%
$0.90↑#11095↓0.310.9 years↓
"Whenever enchanted creature attacks, double the number of +1/+1 counters on it."
Andúril, Narsil Reforged82%
$9.82↑#2600↑0.39↑3.0 years↓
"Whenever equipped creature attacks, put a +1/+1 counter on each creature you control. If you have the city's blessing, put two +1/+1 counters on each creature you control instead."
+1 more matching line
Keleth, Sunmane Familiar82%
$0.18↓#68570.06↓5.9 years↓
"Whenever a commander you control attacks, put a +1/+1 counter on it."
Throwing Knife81%
$0.12↓#27380↓0.05↓11.3 years↓
"Equip "
"