Greatsword of Tyr 

Artifact — Equipment
$0.39 #7230 0.32 4.2 years
Whenever equipped creature attacks, put a +1/+1 counter on it and tap up to one target creature defending player controls.
Equip
(
: Attach to target creature you control. Equip only as a sorcery.)
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Cards similar to Greatsword of Tyr 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.
Elite Scaleguard91%
$0.09↓#8808↓0.06↓11.6 years↑
"Whenever a creature you control with a +1/+1 counter on it attacks, tap target creature defending player controls."
Bone Sabres91%
$5.73↑#59580.243.9 years
"Whenever equipped creature attacks, put four +1/+1 counters on it."
Armory of Iroas91%
$0.22↓#79370.22↓12.3 years↑
"Whenever equipped creature attacks, put a +1/+1 counter on it."
+1 more matching line
Conformer Shuriken90%
$0.34↓#4020↑0.301.2 years↓
"Equipped creature has "Whenever this creature attacks, tap target creature defending player controls. If that creature has greater power than this creature, put a number of +1/+1 counters on this creature equal to the difference.""
+1 more matching line
Thunder Lasso88%
$0.18↓#16009↓0.232.4 years↓
"Whenever equipped creature attacks, tap target creature defending player controls."
+1 more matching line
Baseball Bat87%
$0.09↓#18900↓0.20↓1.9 years↓
"Whenever equipped creature attacks, tap up to one target creature."
Captain America's Shield86%
$0.98↑#62900.00↓0.2 years↓
"Whenever equipped creature attacks, tap target creature defending player controls."
+1 more matching line
Armasaur Guide86%
$0.17↓#17748↓0.05↓1.8 years↓
"Whenever you attack with three or more creatures, put a +1/+1 counter on target creature you control."
Web-Shooters85%
$0.24↓#11598↓0.401.0 years↓
"Equipped creature gets +1/+1 and has reach and "Whenever this creature attacks, tap target creature an opponent controls.""
+1 more matching line
Grasp of the Hieromancer85%
$0.18↓#18920↓0.3911.1 years↑
"Enchanted creature gets +1/+1 and has "Whenever this creature attacks, tap target creature defending player controls.""
Territorial Hammerskull81%
$0.16↓#17850↓0.288.9 years↑
"Whenever this creature attacks, tap target creature an opponent controls."
Star-Crowned Stag81%
$0.05↓#26103↓0.19↓8.1 years↑
"Whenever this creature attacks, tap target creature defending player controls."
Master of Diversion81%
$0.04↓#27139↓0.2413.1 years↑
"Whenever this creature attacks, tap target creature defending player controls."
Fiend Binder81%
$0.04↓#28014↓0.07↓10.1 years↑
"Whenever this creature attacks, tap target creature defending player controls."
Alaborn Cavalier81%
$0.18↓#25073↓0.00↓28.2 years↑
"Whenever this creature attacks, you may tap target creature."
Flanking Troops81%
$2.75↑#30605↓0.00↓27.3 years↑
"Whenever this creature attacks, you may tap target creature."
Seasoned Marshal81%
$0.09↓#29886↓0.07↓29.3 years↑
"Whenever this creature attacks, you may tap target creature."
Bola Slinger80%
$0.06↓#21368↓0.15↓3.4 years
"Whenever this creature attacks, tap target artifact or creature an opponent controls."
Angelic Benediction80%
$0.13↓#13429↓0.2617.9 years↑
"Whenever a creature you control attacks alone, you may tap target creature."