Donna Noble + Spitemare

Prerequisites

You have a way to deal damage to Spitemare. Spitemare has indestructible.

Steps

1. Deal damage to Spitemare
2. Donna Noble and Spitemare trigger.
3. Resolve the Donna Noble trigger, dealing that much damage to an opponent.
4. Resolve the Spitemare trigger, dealing that much damage to itself.
5. Repeat from step 2.