2022-02-18 : If you target both a player and a creature as you activate the ability, and one of the targets is illegal as the ability resolves, Dragonspark Reactor will deal damage to the remaining legal target. If both targets are illegal, the ability won't resolve.

2022-02-18 : Targeting a creature is optional, but you must choose at least one target player to activate Dragonspark Reactor's last ability.