The Armorer

Menace
When The Armorer enters the battlefield, each opponent sacrifices a nontoken creature or planeswalker.
{4}{b}: Exile The Armorer, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery and only if an opponent
has eight or more cards in their graveyard.
"Then, you are a Mandalorian no more."
—The Armorer