Forum:Great Shogun Shien vrs. Face up cards

my opponent has ancient city rainbow ruins face up on the field and four crystal beast in his spell and trap card zone, and i then special summon great shogun shien, and i end my turn. my opponent draws and then activates the 4th ability of ancient city and draws a card, then can he activate another card, because using the ability of a face up card is not the same as activating one?

also if i have stardust on the field and my opponent activates crystal abundance can stardust negate it??