Super-Soldier Serum 

Enchantment — Aura
$0.79 #10429 0.00 0.2 years
Enchant creature
Enchanted creature gets +2/+2, has first strike and vigilance, and is a legendary Soldier in addition to its other types.
Whenever enchanted creature attacks or blocks, attach any number of target Equipment you control to it.
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Cards similar to Super-Soldier Serum 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.
Veteran's Armaments76%
$0.30↓#18232↓0.48↑18.6 years↑
"Equipped creature has "Whenever this creature attacks or blocks, it gets +1/+1 until end of turn for each attacking creature.""
Dub74%
$0.12↓#18715↓0.47↑8.4 years↑
"Enchanted creature gets +2/+2, has first strike, and is a Knight in addition to its other types."
Luminous Wake72%
$0.19↓#22120↓0.0016.4 years↑
"Whenever enchanted creature attacks or blocks, you gain 4 life."
+1 more matching line
Shield of the Righteous72%
$0.24↓#24623↓0.32↑17.3 years↑
"Whenever equipped creature blocks a creature, that creature doesn't untap during its controller's next untap step."
+1 more matching line
On Serra's Wings72%
$0.18↓#5782↑0.38↑8.4 years↑
"Enchanted creature is legendary, gets +1/+1, and has flying, vigilance, and lifelink."
+1 more matching line
Shape of the Wiitigo71%
$0.41↓#25332↓0.29↑20.1 years↑
"At the beginning of your upkeep, put a +1/+1 counter on enchanted creature if it attacked or blocked since your last upkeep. Otherwise, remove a +1/+1 counter from it."
+1 more matching line
Mammoth Harness70%
$0.52↓#31704↓0.27↑30.9 years↑
"Whenever enchanted creature blocks or becomes blocked by a creature, the other creature gains first strike until end of turn."