Ronin Warclub 
Artifact — Equipment
Equipped creature gets +2/+1.
Whenever a creature you control enters, attach this Equipment to that creature.
Equip {5} ({5}: Attach to target creature you control. Equip only as a sorcery.)
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Cards that do something similar expected a card that isn't here?
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Sai of the Shinobi 94%
$0.33#15317
"Whenever a creature you control enters, you may attach this Equipment to it."
+2 more matching lines
Stormrider Rig 94%
$0.17#20580
"Whenever a creature you control enters, you may attach this Equipment to it."
+2 more matching lines
Dredging Claw 90%
$0.18#22790
"Whenever a creature enters from your graveyard, you may attach this Equipment to it."
Hero's Blade 89%
$0.30#1902
"Whenever a legendary creature you control enters, you may attach this Equipment to it."
+2 more matching lines
Grifter's Blade 84%
$0.21#27144
"As this Equipment enters, choose a creature you control it could be attached to. If you do, it enters attached to that creature."
+1 more matching line
Sigarda's Aid 83%
$17.92#856
"Whenever an Equipment you control enters, you may attach it to target creature you control."
Veteran's Armaments 83%
$0.30#17913
"Whenever a Soldier creature enters, you may attach this Equipment to it."
+1 more matching line