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BOING, Fox Mim on the board to send Merlin back to hand for another point of lore, and to Rush any opposing cards

Personally I havent bought anything for years

ETB reveal your top X and put any number of Aura cards with mana value x or less directly on the battlefield

All four have the ability to net card advantage, so the spell gives you card advantage easily

5 Withering Curse Another Strong Removal Spell Black decks aren't short of cheap removal spells, but they're often targeted removal, so Withering Curse helps diversify the options available to the surging Mono-Black decks in Standard

Reap the Past could be an interesting sideboard option for Jund decks, whether exotic, like the above, or more traditional