Flesh Prison

Reach, Defender

When Flesh Prison enters the battlefield, exile target legendary creature. As Flesh Prison leaves the battlefield, return exiled creature to its owners control.

When Flesh Prison enters the battlefield, create five
0/1 Spawn creature tokens with flying, defender, and "Sacrifice this creature: Give Flesh Prison +0/+2"

If Flesh Prison would take damage, give it that many -0/-1 counters instead.