Nyx Infusion 

Enchantment — Aura
$0.05 #29418 0.00 12.3 years
Enchant creature
Enchanted creature gets +2/+2 as long as it's an enchantment. Otherwise, it gets -2/-2.
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Cards similar to Nyx Infusion 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.
Serra's Boon90%
$0.22↑#293900.25↑19.6 years↑
"Enchanted creature gets +1/+2 as long as it's white. Otherwise, it gets -2/-1."
+1 more matching line
Tahngarth's Rage87%
$0.19↑#265670.0028.9 years↑
"Enchanted creature gets +3/+0 as long as it's attacking. Otherwise, it gets -2/-1."
+1 more matching line
Gift of Fangs86%
$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
Phyrexian Boon84%
$0.08↑#301770.0530.2 years↑
"Enchanted creature gets +2/+1 as long as it's black. Otherwise, it gets -1/-2."
Clutch of Undeath78%
$0.17↑#293840.18↑23.3 years↑
"Enchanted creature gets +3/+3 as long as it's a Zombie. Otherwise, it gets -3/-3."
Ironclaw Curse74%
$0.26↑#311830.45↑30.9 years↑
"Enchanted creature gets -0/-1."
+1 more matching line
Exotic Curse74%
$0.12↑#287550.28↑25.9 years↑
"Enchanted creature gets -1/-1 for each basic land type among lands you control."
Sea Legs74%
$0.05#258250.29↑8.6 years↓
"Enchanted creature gets +0/+2 as long as it's a Pirate. Otherwise, it gets -2/-0."
Death's Approach74%
$0.09↑#21100↑0.38↑13.6 years↑
"Enchanted creature gets -X/-X, where X is the number of creature cards in its controller's graveyard."
+1 more matching line
Debilitating Injury72%
$0.04↓#266460.27↑11.9 years
"Enchanted creature gets -2/-2."
+1 more matching line
Kagemaro's Clutch72%
$0.21↑#304320.0021.3 years↑
"Enchanted creature gets -X/-X, where X is the number of cards in your hand."
+1 more matching line