No, Corrupt targets the number of Swamps in general. This includes anything non-swamp that is turned into a Swamp by Urborg, Tomb of Yawgmoth . Any mono-black EDH wants to run it, especially by it only being six mana for a potentially HUGE strike.

you might want Mana Crypt and Thran Dynamo

Corrupt is good but I think it might be unnessecary in this build, as for the mana rocks I don't know what I would cut for them

Depending on how you feel about infinite combos but if you added Triskelavus and Ashnod's Altar , you can combo out if you have Mikaeus, the Unhallowed on the field. You just have to have the original starting mana to take the starting tokens off of Triskelavus , then when you have taken them off, he comes back due to the undying effect on Evil Mike then it's just rinse and repeat and make sure you keep track of what you do because there may be that guy at the table who makes you add it up.

i have Mikaeus, the Unhallowed and Triskelion for the infinite damage combo already, i dont think i have 2 cards to cut to put in another combo that does the same thing and is harder to pull off.