Aurelia, the Warleader +Adarkar Valkyrie +Goblin Bombardment +

Infinite attacks Infinite damage Revised by CR

Attack with Aurelia, the Warleader Aurelia triggers on attack; hold priority with it on the stack Activate Adarkar Valkyrie, tapping her and targeting Aurelia. Sacrifice Aurelia to Goblin Bombardment to deal 1 damage to the opponent. Adarkar Valkyrie's activated ability returns Aurelia to the battlefield You'll gain an extra combat phase Repeat the process for infinite combat and damage.

Legallity