Kiki-Jiki, Mirror Breaker + Phyrexian Metamorph

Steps

1. Activate Kiki-Jiki by tapping it, creating a token copy of Phyrexian Metamorph that has haste. Choose to have Phyrexian Metamorph enter as a copy of Kiki-Jiki.
2. Put the oldest Kiki-Jiki into the graveyard due to the legend rule.
3. Repeat step 1 using the Phyrexian Metamorph token instead.