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Search your library for a card, put that card into your hand, then shuffle.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, add {B}{B}{B}.

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Search your library for a card and put that card into your hand. Then shuffle your library.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, add {B}{B}{B} to your mana pool.

Check to see if there are two or more instant and/or sorcery cards in your graveyard as the spell resolves to determine whether the spell mastery ability applies. The spell itself won’t count because it’s still on the stack as you make this check.