Okay guys, this is first time I have this error.
When I try to SS summon Sillva with Dark Smog (there is no rulings for as cost effect of it) it didnt special summon on to my field. And also I used dark world gates effect to ss summon the Goldd too but it doesnt work too.
Here are the replay for that:

Number 30: Acid Golem of Destruction
2 Level 3 monsters
During your Standby Phase: Detach 1 Xyz Material from this card or take 2000 damage. You cannot Special Summon any monsters. While this card has no Xyz Materials, it cannot attack.

This card was on your side of the field.

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Number 30: Acid Golem of Destruction
2 Level 3 monsters
During your Standby Phase: Detach 1 Xyz Material from this card or take 2000 damage. You cannot Special Summon any monsters. While this card has no Xyz Materials, it cannot attack.

This card was on your side of the field.

Ok, so sorry then. I didnt know number 30's this effect until now. And I thought Number 30 has only cant attack while it has no xyz metarial, thanks its to helped me