Matthew, Son of Kroxa

Whenever Matthew, Son of Kroxa enters in the battlefield or attacks, target opponent sacrifices a creature or planeswalker,
discards a card, and loses 3 life.
Whenever Matthew, Son of Kroxa enters in the battlefield you get a Music Metal Embem.
Escape — {x}{x}{b}{r}, Exile {x} other cards
from an opponent graveyard and from
your graveyard; {x} can't be 0.