Kaya the Inexorable + Phyrexian Altar + Felidar Guardian + Semblance Anvil

Kaya the Inexorable

Phyrexian Altar

Felidar Guardian

Semblance Anvil

How it works

1. Activate Kaya's +1 loyalty ability to put a Ghostform Counter on Felidar Guardian.
2. Sacrifice Felidar Guardian to Phyrexian Altar for .
3. Felidar Guardian is returned to your hand, and you create a 1/1 Spirit creature token.
4. Sacrifice the Spirit for 1.
5. Cast Felidar Guardian for 1.
6. When Felidar Guardian enters the battlefield, exile Kaya and return her to the battlefield.
7. Repeat.