Ordeal of Heliod 
Enchantment — Aura
$0.11 #15793 0.00 12.9 years
Enchant creature
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.
When you sacrifice this Aura, you gain 10 life.
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Cards similar to Ordeal of Heliod expected a card that isn't here?
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Ordeal of Thassa99%
$0.13↑#160070.80↑12.9 years
"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."
+2 more matching lines
Ordeal of Purphoros98%
$0.08↓#20027↓0.50↑13.0 years
"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 Erebos97%
$0.15↑#23269↓0.57↑12.9 years
"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 Nylea96%
$0.14↑#4182↑0.19↑12.9 years
"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."
Bone Sabres73%
$5.73↑#5958↑0.24↑3.9 years↓
"Whenever equipped creature attacks, put four +1/+1 counters on it."
Armory of Iroas73%
$0.22↑#7937↑0.22↑12.3 years
"Whenever equipped creature attacks, put a +1/+1 counter on it."
Armasaur Guide70%
$0.17↑#177480.051.8 years↓
"Whenever you attack with three or more creatures, put a +1/+1 counter on target creature you control."
Casey Jones, Back Alley Brute70%
$0.31↑#7643↑0.000.5 years↓
"Whenever this card attacks, put a +1/+1 counter on target attacking creature."
Elite Scaleguard70%
$0.09↓#8808↑0.0611.6 years↓
"Whenever a creature you control with a +1/+1 counter on it attacks, tap target creature defending player controls."
Curse of Predation70%
$0.20↑#145200.25↑12.8 years
"Whenever a creature attacks enchanted player, put a +1/+1 counter on it."
Songbirds' Blessing70%
$0.57↑#3348↑0.39↑3.0 years↓
"Enchant creature"