Vraska's Final Mercy is a rare Sorcery card from Reality Fracture Promos (PFRA), collector number 71p.
Choose one — • You lose 2 life. Destroy target creature or planeswalker. • You lose 2 life. Empower Jace 6. (Put six loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")