Kiki-Jiki, Mirror Breaker + Thornbite Staff + Workhorse

Kiki-Jiki, Mirror Breaker

Thornbite Staff

Workhorse

How it works

1. Activate Kiki-Jiki by tapping it, creating a token copy of Workhorse with haste, that enters the battlefield with four +1/+1 counters.
2. Activate Workhorse four times by removing four +1/+1 counters from it, adding CCCC.
3. Workhorse dies as a state-based action due to having zero toughness.
4. Kiki-Jiki triggers, untapping itself.
5. Repeat.