The Brother's War

(Any player may attack a duel. Any other player
may choose to block a creature attacking a duel.)

When The Brother's War enters the battlefield,
the next spell you cast this turn has cascade.
When The Brother's War is defeated, you gain 10
life and may return a permanent card from your graveyard to the battlefield. The last player to
attack it gains protection from everything until
the beginning of their next turn.