Shrine of the Forsaken Gods has the ability:
{T}: Add {C}{C}. Spend this mana only to cast colorless spells.
Activate this ability only if you control seven or more lands.
Golgari Rot Farm has the text:
When Golgari Rot Farm enters the battlefield, return a land you control to its owner's hand.
I have 6 lands on the board including Shrine of the Forsaken Gods. If I play a Golgari Rot Farm, can I tap Shrine of the Forsaken Gods for {C}{C} before bouncing the land from Golgari Rot Farm? Do I control seven lands at that point?