Is there a way I can practice with tournament variations? I'm looking up combo tutorials for Erron Black, and I see some for the "52 Kard Pickup" variant. So I hop into practice and select Erron. 
But then all I see are two variations called "Smoking Gun" and "Rifle Through".
Is there a way I can use/create these tournament variations so I can select them not only in practice but also in casual online matches?