Kaya's Ghostform + Phyrexian Altar + Trusty Retriever

Kaya's Ghostform

Phyrexian Altar

Trusty Retriever

How it works

1. Activate Phyrexian Altar by sacrificing Trusty Retriever, adding .
2. When Trusty Retriever dies, Kaya's Ghostform triggers, returning Trusty Retriever from your graveyard to the battlefield.
3. When Trusty Retriever enters the battlefield, it triggers, returning Kaya's Ghostform from your graveyard to your hand.
4. Cast Kaya's Ghostform by paying , attaching it to Trusty Retriever.
5. Repeat.