Mythosaur

Flying
Whenever Mythosaur enters the battlefield or attacks, target opponent sacrifices a creature or planeswalker, discards a card, and loses 3 life.
You draw a card and gain 3 life.
"When the Progenitors arrived, Mandalore was
inhabited by huge horned creatures—the savage mythosaurs. The clans tested themselves against these
great beasts, until all had fallen before their axes and
swords." —Tor Vizsla