Lands dont have mana cost because they are free to play
Once Mega Camerupt ex has been set up, you can use it to sweep
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You can use this effect to Special Summon itself (Eldlich is a Zombie), and if you Special Summon the card this way it gains 1000 attack and defense and cant be destroyed by card effects until the end of your opponents turn
I dug around for some benefits for destroying opponents cards and the pickings are slim, but available in Eumidian Hatchery, and Dingus Egg
BPhillipYork: This is potentially a lot of conniving, and black is in a great position to benefit from dumping things into the yard and reanimate them, or just using his ability with crazy amounts of black mana