Serra's Boon 
Enchantment — Aura
$0.22 #29390 0.25 19.6 years
Enchant creature
Enchanted creature gets +1/+2 as long as it's white. Otherwise, it gets -2/-1.
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Nyx Infusion90%
$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
Phyrexian Boon86%
$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 Rage86%
$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
Armament of Nyx86%
$0.04↓#22370↑0.3112.3 years↓
"Enchant creature"
Gift of Fangs84%
$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
Dog Umbra82%
$0.22#7066↑0.282.2 years↓
"Enchant creature"
Holy Light80%
$2.43↑#293270.2932.1 years↑
"Nonwhite creatures get -1/-1 until end of turn."
Clutch of Undeath78%
$0.17↓#293840.1823.3 years↑
"Enchanted creature gets +3/+3 as long as it's a Zombie. Otherwise, it gets -3/-3."
Steel of the Godhead75%
$2.06↑#3506↑0.2418.3 years↓
"Enchant creature"
Ironclaw Curse72%
$0.26↑#311830.45↑30.9 years↑
"Enchanted creature gets -0/-1."
+1 more matching line
Sulfur Elemental72%
$0.11↓#303010.1819.6 years
"White creatures get +1/-1."
Sea Legs72%
$0.05↓#258250.298.6 years↓
"Enchanted creature gets +0/+2 as long as it's a Pirate. Otherwise, it gets -2/-0."
Exotic Curse72%
$0.12↓#287550.2825.9 years↑
"Enchanted creature gets -1/-1 for each basic land type among lands you control."
Favorable Destiny72%
$0.35↑#20568↑0.41↑29.9 years↑
"Enchanted creature gets +1/+2 as long as it's white."
+1 more matching line
Death's Approach72%
$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
Ballynock Cohort70%
$0.08↓#249750.12↓18.3 years↓
"This creature gets +1/+1 as long as you control another white creature."
Mire's Grasp70%
$0.14↓#20954↑0.00↓6.6 years↓
"Enchanted creature gets -3/-3."
+1 more matching line
Weight of the Underworld70%
$0.03↓#276250.40↑12.6 years↓
"Enchanted creature gets -3/-2."
Dead Weight70%
$0.05↓#14308↑0.43↑14.9 years↓
"Enchanted creature gets -2/-2."
+1 more matching line
Debilitating Injury70%
$0.04↓#266460.2711.9 years↓
"Enchanted creature gets -2/-2."
+1 more matching line