Promotion!

When Promotion! enters the battlefield, return
target creature card from your graveyard to the
battlefield under your control and attach
Promotion! to it.
When Promotion! enters the battlefield, up to
one target creature an opponent controls
becomes a 1/5, loses all other abilities, becomes
a legendary King in addition to its other types,
and gains "If this creature dies in combat, its
controller loses the game."