Nevinyrral's Disk + Darksteel Forge + Mycosynth Lattice + Unwinding Clock

Nevinyrral's Disk
Darksteel Forge
Mycosynth Lattice
Unwinding Clock

Requires
All permanents on the battlefield
Steps
  1. Mycosynth Lattice makes eveything an atrifact, Darksteel Forge makes all of your artifacts indestructible
  2. Nevinyrrall's Disk destroyes all artifacts except yours because yours are indestructable
  3. Unwinding Clock allows this to happen every untap step
Results
Destory all opponent's permanents every turn.