Archmage's Newt

• 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.

• WWizards of the Coast2024-04-12
  Official Ruling
  To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
• WWizards of the Coast2024-04-12
  Official Ruling
  You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.
• WWizards of the Coast2024-04-12
  Official Ruling
  If a card has multiple instances of flashback, you may choose any of its flashback costs to pay.
• WWizards of the Coast2024-04-12
  Official Ruling
  If you cast a spell with flashback, you can't pay any alternative costs such as overload costs. You can pay additional costs such as kicker costs. If the spell has any mandatory additional costs, you must pay those to cast the spell with flashback.
• 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
  You must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.
• WWizards of the Coast2024-04-12
  Official Ruling
  "Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."
• WWizards of the Coast2024-04-12
  Official Ruling
  If you cast an instant or sorcery with in its mana cost and a flashback cost equal to its mana cost, you still choose the value of X as part of casting the spell and paying that cost. If that spell has flashback , you won't be able to choose the value of X; the value of X will simply be 0.
• WWizards of the Coast2024-04-12
  Official Ruling
  A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.
• 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
  If a card with no mana cost gains flashback equal to its mana cost, it has no flashback cost. It can't be cast this way.
• 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
  Creatures with saddle can attack or block as normal even if they aren't saddled.
• WWizards of the Coast2024-04-12
  Official Ruling
  You may activate a permanent's saddle ability even if that permanent is already saddled.
• 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.

Rulings via Scryfall