Grave Researcher // Reanimate (Secrets of Strixhaven Promos #85p)

Creature — Troll Warlock - {2}{B}
At the beginning of your upkeep, surveil 1. Then if there are three or more creature cards in your graveyard, this creature becomes prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)
3/3
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Sorcery - {B}
Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to that card's mana value.