Inalla, Archmage Ritualist + Changeling Titan + Phyrexian Altar

Inalla, Archmage Ritualist

Changeling Titan

Phyrexian Altar

How it works

1. Cast Changeling Titan by paying 4.
2. Changeling Titan enters the battlefield, triggering its champion ability and Inalla.
3. Resolve the Inalla trigger, causing you to pay 1 to create a token copy of Changeling Titan with haste.
4. The token Changeling Titan enters the battlefield, championing the nontoken Changeling Titan.
5. The nontoken Changeling Titan leaves the battlefield, returning nothing from exile to the battlefield.
6. Resolve the nontoken Changeling Titan trigger from step 2, choosing not to exile anything.
7. Activate Phyrexian Altar by sacrificing the Mistbind Clique token, adding at least one mana.
8. The Changeling Titan token leaves the battlefield, returning the nontoken Changeling Titan from exile to the battlefield.
9. Repeat from step 2.