The Battle of Dragon Brothers // Fate Reforged [Unknown Event]

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When The Battle of Dragon Brothers Enters, choose Bolas or Ugin.
• Bolas — Destroy all creatures.
• Ugin — Manifest the top three cards of your library.

I — (Bolas) Each opponent discards their hand. You draw seven cards.
I — (Ugin) Manifest your hand, then draw seven cards.
II — (Both) Create a token that's a copy of any Elder Dragon from the Legends expansion.
III — (Both) Exile Fate Reforged, then return it to the battlefield (Front face up).