Gift of Fangs 
Enchantment — Aura
$0.20 #14834 0.13 4.9 years
Enchant creature
Enchanted creature gets +2/+2 as long as it's a Vampire. Otherwise, it gets -2/-2.
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Nyx Infusion86%
$0.06↓#29606↓0.1112.5 years↑
"Enchanted creature gets +2/+2 as long as it's an enchantment. Otherwise, it gets -2/-2."
Serra's Boon84%
$0.22↑#29677↓0.0619.7 years↑
"Enchanted creature gets +1/+2 as long as it's white. Otherwise, it gets -2/-1."
Olivia's Wrath82%
$0.44↑#2879↑0.56↑4.9 years
"Each non-Vampire creature gets -X/-X until end of turn, where X is the number of Vampires you control."
Tahngarth's Rage82%
$0.18↓#26940↓0.1229.0 years↑
"Enchanted creature gets +3/+0 as long as it's attacking. Otherwise, it gets -2/-1."
Phyrexian Boon80%
$0.09↓#30435↓0.1030.4 years↑
"Enchanted creature gets +2/+1 as long as it's black. Otherwise, it gets -1/-2."
Urge to Feed78%
$0.17↓#118940.1216.7 years↑
"Target creature gets -3/-3 until end of turn. You may tap any number of untapped Vampire creatures you control. If you do, put a +1/+1 counter on each of those Vampires."
Clutch of Undeath78%
$0.11↓#29660↓0.35↑23.4 years↑
"Enchanted creature gets +3/+3 as long as it's a Zombie. Otherwise, it gets -3/-3."
Sea Legs76%
$0.04↓#26098↓0.00↓8.8 years↑
"Enchanted creature gets +0/+2 as long as it's a Pirate. Otherwise, it gets -2/-0."
+1 more matching line
Anointed Deacon74%
$0.14↓#25253↓0.129.1 years↑
"At the beginning of combat on your turn, you may have target Vampire get +2/+0 until end of turn."