Kira, Fetishist Murderer

Menace, Trample

Bites the Dust {5}{b}{b}{b}, {t} Reset the battlefield to how it was last turn and put an explosion counter on a creature, if not removed, this creature will be destroyed during your next turn

Sheer Heart Attack {b}{b}{u}, Destroy a creature card, if this effect is countered, Kira phases out until this creature is destroyed