To set this explosive loop into motion, you first need to shield your board by casting Unbreakable Formation so your creatures can weather the incoming storm safely. Once your team is safe, dealing that initial spark of damage to Red Hulk triggers its enrage ability to drop a +1/+1 counter and hurl damage at Boros Reckoner. This invites a violent ping-pong match, as Boros Reckoner's damage-reflection trigger fires right back at Red Hulk, which in turn grows the counter count and escalates the damage dealt with every single iteration.