Fortune, Loyal Steed

• WOTC Official Reminder Textofficial rules
  Saddle — Tap any number of other untapped creatures you control with total power N or greater: This Mount becomes saddled until end of turn. Saddle only as a sorcery.
• WOTC Official Reminder Textofficial rules
  Scry — Look at the top N cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.

• WWizards of the Coast2024-04-12
  Official Ruling
  "Saddled" isn't an ability that a creature has. It's just something true about that creature. It won't stop being saddled until the turn ends or it leaves the battlefield.
• WWizards of the Coast2024-04-12
  Official Ruling
  An ability that triggers when a creature "attacks while saddled" will trigger only if that creature was saddled when it was declared as an attacker.
• WWizards of the Coast2024-04-12
  Official Ruling
  "Saddle N" means "Tap any number of other untapped creatures you control with total power N or greater: This permanent becomes saddled until end of turn. Activate only as a sorcery."
• WWizards of the Coast2024-04-12
  Official Ruling
  Fortune's middle ability creates a delayed triggered ability that triggers at end of combat. This ability will trigger whether or not Fortune is still on the battlefield. If it's not, you can still exile up to one creature that saddled it that turn.
• WWizards of the Coast2024-04-12
  Official Ruling
  Tokens exiled by the delayed triggered ability won't return to the battlefield. It's usually not a good idea to saddle Fortune if Fortune itself is a token.
• WWizards of the Coast2024-04-12
  Official Ruling
  Creatures with saddle can attack or block as normal even if they aren't saddled.
• WWizards of the Coast2024-04-12
  Official Ruling
  If a permanent becomes a copy of a saddled Mount, the copy won't be saddled.
• WWizards of the Coast2024-04-12
  Official Ruling
  The delayed triggered ability doesn't target any creature. You choose which other creature to exile, if any, as that ability is resolving. At that point, it's too late for any player to respond.
• WWizards of the Coast2024-04-12
  Official Ruling
  You may activate a permanent's saddle ability even if that permanent is already saddled.

Rulings via Scryfall