Gríma, Saruman's Footman

• WWizards of the Coast2023-06-16
  Official Ruling
  If the spell you cast has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
• WWizards of the Coast2023-06-16
  Official Ruling
  If you cast a spell "without paying its mana cost," you can't pay any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.
• WWizards of the Coast2023-06-16
  Official Ruling
  If that player exiles their entire library without exiling an instant or sorcery card, they will randomize the order of the exiled cards, and the cards then become that player's library, ending the effect. They will not continue to exile and randomize their library forever.
• WWizards of the Coast2023-06-16
  Official Ruling
  If you choose not to cast the card, it is put on the bottom of its owner's library in a random order along with the other exiled cards.
• WWizards of the Coast2023-06-16
  Official Ruling
  You cast the card while the ability is resolving and still on the stack. You can't wait to cast it later in the turn.
• WWizards of the Coast2023-06-16
  Official Ruling
  The cards are exiled face up. All players will be able to see them.

Rulings via Scryfall