mtg black discard cards The Best In Mono Black Devotion Control Discard

For just 2 mana and a tap, you can sacrifice an artifact to tutor one from your library with mana value 1 higher and put it straight onto the battlefield

Can I Exile a Card in Exile

The most obvious target would be extra combat spells, especially if you've adding on some mana generators from attacking (various treasure generators, Neheb, some dragons)

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[13] With that said, theres nothing wrong with throwing away the best creature on the board by attacking into a creature with deathtouch if momentum is still on your side