If Hidden Blade is flipped from hidden to kill a unit at a battlefield, and in response Tideturner is flipped to move that unit to a different battlefield, does Hidden Blade lose its target?

Ruling: Yes, Hidden Blade loses its target and no unit will die and no cards will be drawn. However, the card is still considered played (so effects like Ravenbloom that trigger on playing cards still work).

Sequence:

• Hidden Blade is flipped from hidden targeting a unit at a specific battlefield
• Tideturner is flipped in response, moving the unit to a different battlefield
• Hidden Blade resolves but the target is now illegal (unit is at a different battlefield)
• No unit dies and no cards are drawn
• Hidden Blade is still considered played for other card effects

Nuances:

• Hidden Blade played from hand only requires the unit to be at any battlefield at resolution
• Hidden Blade played from hidden has an extra targeting requirement that the unit must be at that specific battlefield
• When played from hidden, if the target becomes illegal, the controller cannot be determined, so no cards are drawn
• Effects always resolve doing as much as they can unless countered
• This interaction does NOT work the same way with Riptide Rex, as Rex only requires the unit to be at any battlefield