If Hidden Blade targets Yasuo but Yasuo uses Flash in response to leave the battlefield, does Hidden Blade still resolve and trigger effects like drawing 2 cards and Student triggers?

Ruling: Hidden Blade still fully resolves even when its target is no longer on the battlefield, but it has no effect on the board state (it "whiffs"). You do NOT draw the 2 cards because the controller of the card cannot be defined when the target is missing. However, you DO still get triggers from cards like Ravenblood Student or Ezreal.

Sequence:

• Hidden Blade is cast targeting Yasuo
• Yasuo uses Flash in response, leaving the battlefield
• Hidden Blade resolves but whiffs (target is gone)
• No damage dealt, no cards drawn
• Student triggers and similar effects still activate

Nuances:

• The spell does not "fizzle" in the traditional card game sense - it fully resolves
• Drawing 2 cards specifically does not happen because the controller cannot be defined without a valid target
• Effects that trigger on spell resolution (like Ravenblood Student) still trigger despite the whiff