Alela, Artful Provocateur + Cloudstone Curio + Phyrexian Walker + Shield Sphere

Alela, Artful Provocateur

Cloudstone Curio

Phyrexian Walker

Shield Sphere

How it works

1. Cast Phyrexian Walker by paying 0.
2. Alela triggers, creating a 1/1 Faerie creature token.
3. The Faerie enters the battlefield, triggering Cloudstone Curio, returning Shield Sphere from the battlefield to your hand.
4. Cast Shield Sphere by paying 0.
5. Alela triggers, creating a 1/1 Faerie creature token.
6. The Faerie enters the battlefield, triggering Cloudstone Curio, returning Phyrexian Walker from the battlefield to your hand.
7. Repeat.