Undead Sprinter

• WWizards of the Coast2024-09-20
  Official Ruling
  You still pay all costs and obey timing restrictions when casting Undead Sprinter from your graveyard with the permission from its last ability.
• WWizards of the Coast2024-09-20
  Official Ruling
  If Undead Sprinter is countered or dies after being cast from your graveyard, it will return to your graveyard. It may be cast this way again.
• WWizards of the Coast2024-09-20
  Official Ruling
  Once you begin casting a spell from your graveyard, it immediately moves to the stack. Players can't take any actions until you've finished casting the spell.

Rulings via Scryfall