Curse of Predation 

Enchantment — Aura Curse
Enchant player
Whenever a creature attacks enchanted player, put a +1/+1 counter on it.
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Cards that do something similar expected a card that isn't here?
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Ordeal of Erebos 88%
$0.13#22948
"Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice this Aura."
+1 more matching line
Ordeal of Purphoros 88%
$0.17#19705
"Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice this Aura."
+1 more matching line
Ordeal of Heliod 88%
$0.11#15562
"Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice this Aura."
Ordeal of Nylea 88%
$0.19#4101
"Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice this Aura."
Ordeal of Thassa 88%
$0.14#15770
"Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice this Aura."
Curse of the Forsaken 80%
$0.40#17040
"Whenever a creature attacks enchanted player, its controller gains 1 life."
+1 more matching line