Domri, Anarch of Bolas

Because it's a loyalty ability, Domri's first loyalty ability isn't a mana ability. It can be activated only any time you could cast a sorcery. It uses the stack and can be responded to.

A spell or ability that counters spells can still target a creature spell you control after Domri's first loyalty ability has resolved. When that spell or ability resolves, the creature spell won't be countered, but any additional effects of that spell or ability will still happen.

If either target is an illegal target as Domri's last ability resolves, no creature will deal or be dealt damage.