Oracle

Enchantment - Aura 

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 Ordeal of Erebos.
When you sacrifice Ordeal of Erebos, target player discards two cards.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

9/15/2013
The +1/+1 counter is put on the creature before blockers are declared and before combat damage is dealt.

9/15/2013
The check of whether the enchanted creature has three or more +1/+1 counters on it happens as part of the resolution of the attack triggered ability. If the third +1/+1 counter is put on the enchanted creature any other way, you won’t sacrifice the Ordeal until the next time the creature attacks.

9/15/2013
If you sacrifice the Ordeal in some other way, its last ability will trigger.

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