The Beamtown Bullies + Bronze Bombshell + Thornbite Staff

Prerequisites

Thornbite Staff attached to The Beamtown Bullies.

Steps

1. During an opponent's turn, activate The Beamtown Bullies by tapping it, putting Bronze Bombshell onto the battlefield under that opponent's control.
2. Bronze Bombshell triggers, causing the opponent to sacrifice it and deal seven damage to that opponent.
3. Bronze Bombshell dies, triggering The Beamtown Bullies, untapping The Beamtown Bullies.
4. Repeat.