Ill-Tempered Loner // Howlpack Avenger + Pain for All

Prerequisites

You control an indestructible creature with power 1 or greater. You control another creature if the indestructible creature's power is greater than or equal to Howlpack Avenger's toughness, or if Howlpack Avenger is the aforementioned indestructible creature.

Steps

1. Cast Pain for All by paying {2}{R}, attaching it to an indestructible creature you control with power 1 or greater.
2. When Pain for All enters, it triggers, causing the creature it's attached to to deal damage to another creature you control.
3. Howlpack Avenger triggers, dealing that much damage to the indestructible creature.
4. Howlpack Avenger and Pain for All trigger.
5. Resolve the Pain for All trigger, dealing that much damage to each opponent.
6. Resolve the Howlpack Avenger trigger, dealing that much damage to the indestructible creature.
7. Repeat from step 4.