Obviously this goes with this week's freebie from Epic. Price is after the $15 off coupon has been applied. Original deal: $15 off Coupon (Min $22.99 Spend) @ Epic Games
I am posting this separately because (a) it is not a freebie and (b) this offer expires later than the freebie, namely at the end of the Mega Sale.
The Platinum Edition will give you:
Six Civilization & Scenario DLC packs as well as the Rise and Fall and Gathering Storm expansions.