Nether Void

Whenever a player casts a spell, counter it unless that player pays .

Darkness

Prevent all combat damage that would be dealt this turn.

Invoke Prejudice

Whenever an opponent casts a creature spell that doesn’t share a color with a creature you control, counter that spell unless that player pays , where X is its converted mana cost.

Sylvan Library

At the beginning of your draw step, you may draw two additional cards. If you do, choose two cards in your hand drawn this turn. For each of those cards, pay 4 life or put the card on top of your library.