If Hidden Blade targets a unit that is then Retreated (returned to hand) before Hidden Blade resolves, does Hidden Blade retarget another unit or draw cards?

Question

Accepted Answer

Ruling: Hidden Blade does not retarget another unit, nor does it cause the player to draw cards. Once targets have been chosen, they cannot be changed, and if the target is no longer visible when Hidden Blade resolves, it whiffs completely.

Sequence:
- Player attacks with 1M unit and 2M unit
- Opponent plays Hidden Blade targeting the 1M unit
- Player Retreats the 1M unit (returns it to hand)
- Hidden Blade cannot retarget the 2M unit
- Hidden Blade whiffs completely (no card draw occurs)