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First, while a nonmodal double-faced card is on the battlefield with its back face up, the mana value of that permanent is calculated using the mana cost of the front face

There are a couple other theories floating around though

The front side is a decent looter that threatens to do way more later on, and if you can embrace the stares from the table correctly assessing you to be the threat or bad guy or, dare I say, the Bolas, I'd say get this power in the command zone

Make use of the HyperGeometric calculator, and if youre building your deck list online, some websites such as Moxfield provide great stats such as colour breakdown, costing curve etc