Void Dragon C'tan Shard

Flying, Infect, Indestructible
When you cast Void Dragon C'tan Shard, each
opponent shuffles each artifact they control
into their deck. Put a +1/+1 counter on Void
Dragon C'tan Shard for each artifact that
leaves the battlefield this way.
Whenever Void Dragon C'tan Shard enters
the battlefield or attacks, sacrifice it unless
you control a necron wizard or necron
noble creature.