Hidden Blade

If Hidden Blade's target is legal when the spell begins resolving and remains on the board after the kill is prevented or replaced, its controller draws 2; if a replacement causes it to leave the board, no player draws. The phrase "its controller" links the draw to the unit affected by the preceding kill instruction.^359.3.e.14 If the legal target can't be killed, the kill instruction is negated rather than ignored.^359.3.e.6 Negating or replacing that kill does not stop the linked draw because the draw instruction does not refer to the kill action.^359.3.e.14.b

• The unit remains on the board: Hidden Blade can identify its controller, and that player draws 2.^359.3.e.12.a For example, Zhonya's Hourglass recalls the unit to base, where it remains on the board under its controller.
• The unit leaves the board: Hidden Blade can no longer identify a controller for that card, so no player draws.^359.3.e.12 For example, a unit previously affected by Smite is banished instead when Hidden Blade would kill it.

No. An illegal target is unaffected by Hidden Blade, so the kill instruction is ignored.^359.3.e.5 Hidden Blade's draw is linked to its kill instruction because "its controller" refers to the unit affected by that instruction.^359.3.e.14 When an earlier linked instruction is ignored, its later linked instructions are also ignored, so the controller does not draw.^359.3.e.14.a