Dormant Sliver + Maskwood Nexus + Fractured Identity

Dormant Sliver

Maskwood Nexus

Fractured Identity

How it works

1. Cast Fractured Identity by paying 3, exiling Maskwood Nexus and causing each opponent to create a token copy of it.
2. Because each opponent controls a Maskwood Nexus, their creatures are all Slivers and cannot attack due to having defender, which is granted by Dormant Sliver.