Rulings

• “This spell can’t be countered” means it can’t be countered even by the ward keyword ability. If you cast Lithomantic Barrage targeting a creature or planeswalker with ward, you may still pay the ward cost if you want to, but Lithomantic Barrage won’t be countered if you don’t.2023-04-14
• Spells and abilities that counter spells can still target Lithomantic Barrage. Such a spell or ability won’t counter Lithomantic Barrage, but any additional effects of that spell or ability will still happen.2023-04-14