Seriously, you're playing mono black and trying to find cards to do things that black just doesn't do. If you want effective answers to artifacts and enchantments you're going to have to either make everybody discard those before they get played, or start adding artifacts or a second color.
Questions about improving combos and balancing card types aren't on topic for the Rulings forum, so I'm going to lock this now that the rules question has been answered.
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Nevinyrral's Disk.
Seriously, you're playing mono black and trying to find cards to do things that black just doesn't do. If you want effective answers to artifacts and enchantments you're going to have to either make everybody discard those before they get played, or start adding artifacts or a second color.
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That action causes a triggered ability on Oblivion Ring to trigger. This triggered ability is not a spell. Therefore it can target Emrakul.
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