Bladewing's Thrall + Cloudstone Curio + Changeling Outcast + Phyrexian Altar

Bladewing's Thrall

Cloudstone Curio

Changeling Outcast

Phyrexian Altar

How it works

1. Cast Changeling Outcast by paying .
2. When Changeling Outcast enters the battlefield, Cloudstone Curio and Bladewing's Thrall trigger.
3. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand.
4. Resolve the Bladewing's Thrall trigger, returning it from your graveyard to the battlefield.
5. When Bladewing's Thrall enters the battlefield, Cloudstone Curio triggers, returning Changeling Outcast from the battlefield to your hand.
6. Activate Phyrexian Altar by sacrificing Bladewing's Thrall, adding .
7. Repeat.

This clever loop turns the fluid nature of Changeling Outcast into an engine of continuous rebirth, relying on its universal creature types to satisfy the Dragon requirement for Bladewing's Thrall every time either creature enters the battlefield. With Cloudstone Curio sitting quietly on the board, playing the Outcast allows the Thrall to sneak back from the graveyard, and the subsequent entrance of the Thrall triggers the Curio to bounce the Outcast right back to your hand. Meanwhile, Phyrexian Altar stands ready to harvest Bladewing's Thrall for the exact black mana needed to cast Changeling Outcast all over again, generating an endless cascade of sacrifices, enters-the-battlefield triggers, and storm count.