Ordeal of Purphoros
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 this Aura.
When you sacrifice this Aura, it deals 3 damage to any target.
Maciej Kuciara
Jumpstart 2022 (J22)
• #577Rulings
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.
(wotc • 2013-09-15)
The +1/+1 counter is put on the creature before blockers are declared and before combat damage is dealt.
(wotc • 2013-09-15)
If you sacrifice the Ordeal in some other way, its last ability will trigger.
(wotc • 2013-09-15)
Rulings
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.
(wotc • 2013-09-15)
The +1/+1 counter is put on the creature before blockers are declared and before combat damage is dealt.
(wotc • 2013-09-15)
If you sacrifice the Ordeal in some other way, its last ability will trigger.
(wotc • 2013-09-15)