Strong Back 
Enchantment — Aura
$2.10 #3216 0.34 2.5 years
Enchant creature
Equip abilities you activate that target enchanted creature cost 
less to activate.
less to activate.Aura spells you cast that target enchanted creature cost less to cast.
less to cast.Enchanted creature gets +2/+2 for each Aura and Equipment attached to it.
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Cards similar to Strong Back 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.
Champion of the Flame87%
$0.06↓#9501↓0.06↓8.4 years↑
"This creature gets +2/+2 for each Aura and Equipment attached to it."
With Great Power . . .86%
$0.73↓#4917↓0.00↓1.0 years↓
"Enchanted creature gets +2/+2 for each Aura and Equipment attached to it."
+1 more matching line
Transcendent Envoy84%
$0.17↓#28340.19↓6.6 years↑
"Aura spells you cast cost 
less to cast."
less to cast."
Mantle of the Ancients84%
$7.75↑#1392↑0.345.1 years↑
"Enchanted creature gets +1/+1 for each Aura and Equipment attached to it."
+2 more matching lines
Gunner Conscript83%
$0.23↓#14327↓0.50↑2.5 years
"This creature gets +1/+1 for each Aura and Equipment attached to it."
Hero of Iroas82%
$0.66↓#7118↓0.17↓12.6 years↑
"Aura spells you cast cost less to cast."
less to cast."
Bruenor Battlehammer82%
$0.54↓#2402↑0.18↓5.1 years↑
"Each creature you control gets +2/+0 for each Equipment attached to it."
+1 more matching line
Thran Power Suit81%
$1.15↓#1592↑0.23↓3.8 years↑
"Equipped creature gets +1/+1 for each Aura and Equipment attached to it and has ward ."
."
Dwarven Mauler80%
$0.31↓#14287↓0.00↓0.1 years↓
"Equip abilities you activate that target this creature cost less to activate."
less to activate."
Heavenly Blademaster80%
$0.38↓#11220↓0.438.1 years↑
"Other creatures you control get +1/+1 for each Aura and Equipment attached to this creature."
+1 more matching line
Danitha Capashen, Paragon79%
$0.33↓#796↑0.18↓8.4 years↑
"Aura and Equipment spells you cast cost less to cast."
less to cast."
Animal Friend78%
$0.71↓#9884↓0.20↓2.5 years
"Enchanted creature has "Whenever this creature attacks, create a 1/1 green Squirrel creature token. Put a +1/+1 counter on that token for each Aura and Equipment attached to this creature other than this card.""
Golem-Skin Gauntlets78%
$0.21↓#7256↓0.00↓22.9 years↑
"Equipped creature gets +1/+0 for each Equipment attached to it."
Kellan, the Fae-Blooded // Birthright Boon76%
$5.58↑#31900.403.0 years
"Other creatures you control get +1/+0 for each Aura and Equipment attached to this card."
Graceblade Artisan76%
$0.12↓#23749↓0.2611.4 years↑
"This creature gets +2/+2 for each Aura attached to it."
Rabid Wombat76%
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"This creature gets +2/+2 for each Aura attached to it."
Cloud, Planet's Champion76%
$1.40↓#7148↓0.48↑1.2 years↓
"Equip abilities you activate that target this card cost less to activate."
less to activate."
Auramancer's Guise76%
$0.59↓#9200↓0.00↓19.6 years↑
"Enchanted creature gets +2/+2 for each Aura attached to it and has vigilance."
+1 more matching line
Uril, the Miststalker76%
$1.20↓#13494↓0.21↓17.3 years↑
"this card gets +2/+2 for each Aura attached to it."
Bladehold War-Whip76%
$0.32↓#5869↓0.253.6 years↑
"Equip abilities you activate of other Equipment cost less to activate."
less to activate."