Dual Nature + Faerie Impostor + Phyrexian Altar

Dual Nature

Faerie Impostor

Phyrexian Altar

How it works

1. Cast Faerie Impostor by paying .
2. Faerie Impostor and Dual Nature's first ability trigger.
3. Resolve the Dual Nature ability, creating a token copy of Faerie Impostor.
4. The Faerie Impostor token triggers, returning the nontoken Faerie Impostor from the battlefield to your hand.
5. Dual Nature's second ability triggers.
6. In response, sacrifice the token Faerie Impostor to Phyrexian Altar for .
7. Resolve the Dual Nature ability, exiling zero creatures.
8. Resolve the Faerie Impostor ability, returning a creature you control from the battlefield to your hand if desired.
9. Repeat.