The sneak attack has nothing really to do with it.
The annihilator trigger will already be on the stack at the earliest time Wing Shards will be able to do anything. Sacrificing Emrakul doesn't make the trigger go away, so Wing Shards will not be saving them from the Annihilator 6 effect.
If I get emrakul in play from Sneak Attack and they cast WS anillator 6 still happens correct?
Because he is already attacking right?
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The annihilator trigger will already be on the stack at the earliest time Wing Shards will be able to do anything. Sacrificing Emrakul doesn't make the trigger go away, so Wing Shards will not be saving them from the Annihilator 6 effect.
Live in Northern AZ? Lets play some Legacy! Catch me on MODO!
Awesome sig by the one and only DarkNightCavalier from Heroes of the Plane Studios