If I play Ride the Wind targeting my unit at Vilemaw’s Lair and attempt to move them to base, what happens?

They will be readied.

This is a rules quirk that players and judges identified as a result of a small additional rule added in the Vendetta rules update. This isn’t an actual change to how this has been interpreted and ruled on previously — it’s smoothing out a bug in how broadly “ignored” instructions were defined.

An ignored instruction is one that wasn’t performed as part of the execution of a spell or ability’s instructions because it mistargeted (i.e. because the targeted object wasn’t a legal target on resolution). For example, you play Hidden Blade choosing an enemy unit and they play Star-Crossed in reaction, returning their unit to hand — when Hidden Blade resolves, the unit isn’t on the board, so we ignore the “Its controller draws 2.” instruction. Alternatively, if Hidden Blade is given the Repeat keyword by the Academy and both executions target the same unit, this is why the unit’s controller doesn’t draw 4 cards.

An instruction is not ignored if an ability, effect, or circumstance of the game prevents it from occurring. That could be a replacement effect, an ability like Vilemaw’s Lair that says “Units can’t move from here to base,” a game action like Buff or Ready on a unit that already has the appropriate state, or a unit/gear/spell no longer being in an appropriate zone as long as the instruction doesn’t target those objects. In those cases the instruction isn’t ignored, but instead negated. A negated instruction has its effects skipped, replaced, or prevented. A negated instruction will not cause any linked instructions to be ignored unless those instructions refer specifically to the action being performed.

Examples:

1. If a unit at a battlefield says “I can’t be killed.” and a player plays Hidden Blade choosing that unit, the unit’s controller will still draw 2 on resolution of Hidden Blade. (Negated, not ignored — linked instruction still executes.)
2. If a unit at a battlefield is chosen by Hidden Blade and in reaction its controller plays Flash moving it to base, that unit’s controller will not draw 2 on resolution of Hidden Blade. (Ignored — linked instructions ignored.)
3. If a unit at a battlefield is chosen by Hidden Blade and in reaction its controller plays Zhonya’s Hourglass, that unit’s controller will draw 2 on resolution of Hidden Blade. (The unit is on the board and its information can be checked; negated, not ignored.)
4. If a unit at a battlefield has been affected by Smite previously this turn and it is chosen by Hidden Blade, that unit’s controller will not draw 2 on resolution of Hidden Blade. (The instruction is executed, but the unit is not on the board to have its information checked; it was also moved to a non-board zone by an effect other than Hidden Blade, so it no longer has a controller Hidden Blade can reference.)