When Hidden Blade targets a unit that gets recalled to base (via Sett legend ability after another Hidden Blade resolves), does the controller still draw 2 cards?

Ruling: When Hidden Blade resolves but its target is no longer at a battlefield (having been recalled to base), the controller does not draw cards because the unit is no longer a legal target and "its controller" cannot be determined.

Sequence:

• First Hidden Blade resolves, kills the unit, and Sett legend ability saves it by recalling it to base
• The controller draws 2 cards for their Hidden Blade (the unit was a legal target when that spell began resolving and information can still be referenced)
• Second Hidden Blade resolves, but the unit is now at base, not at a battlefield
• The unit is no longer a legal target, so its information cannot be referenced
• "Its controller" is meaningless and no cards are drawn

Nuances:

• If a unit is saved by an ability during Hidden Blade's resolution (like Zhonya's), the controller still draws because the target was legal when resolution started and the unit remains on the board
• The key distinction is whether the unit becomes an illegal target before resolution starts versus during resolution
• Target legality is checked when the spell starts resolving