Clutch of Undeath 
Enchantment — Aura
$0.17 #29384 0.18 23.3 years
Enchant creature
Enchanted creature gets +3/+3 as long as it's a Zombie. Otherwise, it gets -3/-3.
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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.
Noxious Ghoul85%
$1.30↑#4469↑0.39↑23.6 years
"Whenever this creature or another Zombie enters, all non-Zombie creatures get -1/-1 until end of turn."
Armament of Nyx80%
$0.04↓#22370↑0.31↑12.3 years↓
"Enchant creature"
Nyx Infusion78%
$0.05↓#294180.00↓12.3 years↓
"Enchanted creature gets +2/+2 as long as it's an enchantment. Otherwise, it gets -2/-2."
+1 more matching line
Gift of Fangs78%
$0.21↑#14629↑0.60↑4.8 years↓
"Enchanted creature gets +2/+2 as long as it's a Vampire. Otherwise, it gets -2/-2."
+1 more matching line
Serra's Boon78%
$0.22↑#293900.2519.6 years↓
"Enchanted creature gets +1/+2 as long as it's white. Otherwise, it gets -2/-1."
+1 more matching line
Dog Umbra76%
$0.22↑#7066↑0.28↑2.2 years↓
"Enchant creature"
Feeding Frenzy74%
$0.20↑#238660.2723.9 years
"Target creature gets -X/-X until end of turn, where X is the number of Zombies on the battlefield."
Phyrexian Boon72%
$0.08↓#301770.05↓30.2 years↑
"Enchanted creature gets +2/+1 as long as it's black. Otherwise, it gets -1/-2."
Tahngarth's Rage72%
$0.19↑#265670.00↓28.9 years↑
"Enchanted creature gets +3/+0 as long as it's attacking. Otherwise, it gets -2/-1."
+1 more matching line
Paroxysm72%
$0.19↑#308550.33↑28.2 years↑
"Enchant creature"
Tall as a Beanstalk71%
$0.13↓#23163↑0.00↓6.9 years↓
"Enchant creature"
Mythic Proportions71%
$0.54↑#22930↑0.38↑23.9 years
"Enchant creature"
Impending Doom70%
$0.10↓#247020.64↑6.6 years↓
"Enchant creature"