Nyx Infusion 

Enchantment — Aura
$0.06 #29606 0.11 12.5 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↑#296770.0619.7 years↑
"Enchanted creature gets +1/+2 as long as it's white. Otherwise, it gets -2/-1."
Tahngarth's Rage87%
$0.18↑#269400.1229.0 years↑
"Enchanted creature gets +3/+0 as long as it's attacking. Otherwise, it gets -2/-1."
Gift of Fangs86%
$0.20↑#14834↑0.134.9 years↓
"Enchanted creature gets +2/+2 as long as it's a Vampire. Otherwise, it gets -2/-2."
Phyrexian Boon84%
$0.09↑#304350.1030.4 years↑
"Enchanted creature gets +2/+1 as long as it's black. Otherwise, it gets -1/-2."
Sea Legs78%
$0.04↓#260980.00↓8.8 years↓
"Enchanted creature gets +0/+2 as long as it's a Pirate. Otherwise, it gets -2/-0."
+1 more matching line
Clutch of Undeath78%
$0.11↑#296600.35↑23.4 years↑
"Enchanted creature gets +3/+3 as long as it's a Zombie. Otherwise, it gets -3/-3."
Ironclaw Curse74%
$0.33↑#314930.1931.1 years↑
"Enchanted creature gets -0/-1."
+1 more matching line
Exotic Curse74%
$0.13↑#289990.28↑26.0 years↑
"Enchanted creature gets -1/-1 for each basic land type among lands you control."
Death's Approach74%
$0.16↑#21466↑0.1113.7 years↑
"Enchanted creature gets -X/-X, where X is the number of creature cards in its controller's graveyard."
Kagemaro's Clutch72%
$0.21↑#306940.00↓21.4 years↑
"Enchanted creature gets -X/-X, where X is the number of cards in your hand."
Viper's Kiss70%
$0.09↑#18731↑0.35↑13.1 years
"Enchanted creature gets -1/-1, and its activated abilities can't be activated."