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This card has many uses, as it becomes Dark Magician while on the field, which is great when you have cards that specifically mention it or if you need a specific material for a Fusion Summon

Hand Denial: Blue and black are the only two colors that can easily deal with a threat before it hits the battlefield

Below are some tech cards I'd like to introduce

Grist, the Hunger Tide is a three-mana Black and Green planeswalker that can do a bit of self-mill and make Insect tokens, sacrifice creatures to destroy creatures or planeswalkers, or drain the life from your enemies based on the number of creatures in your graveyard

Siege-Gang Lieutenant chips in as a much costlier substitute, but if you need to deal that final damage and can't squeeze another attack in, it'll do the job