Mjölnir, Storm Hammer 
Legendary Artifact — Equipment
$3.03 #3175 0.72 2.2 years
When Mjölnir enters, attach it to target legendary creature you control.
Whenever equipped creature attacks, tap target creature defending player controls and put a stun counter on it. Then Mjölnir deals damage to each opponent equal to the number of tapped creatures that opponent controls.
Equip 
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Cards similar to Mjölnir, Storm Hammer 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.
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"When this Equipment enters, attach it to target creature you control."
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"When this Equipment enters, attach it to target creature you control."
+1 more matching line
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"When this Equipment enters, attach it to target creature you control."
+1 more matching line
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"When this Equipment enters, attach it to target creature you control."
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"When this Equipment enters, attach it to target creature you control."
+1 more matching line
Paladin's Shield76%
$0.20↓#20216↓0.36↓5.1 years↑
"When this Equipment enters, attach it to target creature you control."
+1 more matching line
Mirran Banesplitter76%
$0.21↓#12866↓0.33↓3.4 years↑
"When this Equipment enters, attach it to target creature you control."
+1 more matching line
Greatsword of Tyr75%
$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."
Cliffhaven Kitesail75%
$0.11↓#6147↓0.44↓5.9 years↑
"When this Equipment enters, attach it to target creature you control."
+1 more matching line
Mechanical Glider75%
$0.17↓#12449↓0.00↓0.8 years↓
"When this Equipment enters, attach it to target creature you control."
+1 more matching line
Hookblade75%
$0.22↓#11303↓0.19↓2.2 years
"When this Equipment enters, attach it to target creature you control."
Malamet Scythe74%
$0.14↓#20670↓0.29↓2.8 years
"When this Equipment enters, attach it to target creature you control."
+1 more matching line