Grave Researcher // Reanimate

Creature — Troll Warlock

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.)

Sorcery

Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to that card's mana value.