Use the total mana value of other permanents you control as Summon: Bahamut's fourth chapter ability resolves to determine how much damage is dealt
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Even if you don't draw into your basic lands, it is still a dual land which is almost always going to be better than a basic land since it can tap for either of the colors your deck needs.
With a few token doublers (Elspeth from Tarkir: Dragonstorm is particularly good here) it put in the work, but you'll need to spend a lot of time building up your mana first
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Its also very mean with extra combat steps, which angels like Aurelia, the Warleader provide