Ok, 16 lands is probably better
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The base cost is 3, it works pretty well actually
So crypt ghast needs to be added to this deck. The combo with manaforge cinder is amazing, instead of just adding an extra one black mana you'd get an extra 6 if you throw it threw manaforge before using it and it would only cost 2 land for 7 usable mana, that's a bit OP right there
So other than fogbank you have absolutely no defense against flying creatures, so if I play an all flyer deck you lose really fast