If there are no creature cards in th gy,
Can I still cast {Skaab Goliath }?
Nope, sorry.
If it said "when it enters the battlefield" then you could.
Quote from: Jroch314 on August 12, 2012, 11:12:30 PM
If it said "when it enters the battlefield" then you could.
If it said this, then you would be able to exile two non-existent creatures because it wouldn't be a part of the cost of summoning the skaab. Because you cannot meet both requirements of the cost, you would not be able to cast the skaab and it would be considered an illegal move.