Ok so you want to use a Set effect to make the target point that a Location Range validator uses to disable a Buff used for the casting. Seems you want to create a tunnel entrance unit using a Create Unit effect that uses a Teleport effect on any units ordered to move to it and are close enough. A Create Persistent effect that uses a periodic Search Area effect that has the teleport or launch missile effect validated by a Unit Compare Order Target Range validator could be used for the transportation.
Rather use a Launch Missile effect like the ultralisk burrow charge. Do not order the unit to burrow but just get the effects of the ability to make the unit play/stop the burrow animation bracket.
The Battery ability uses an effect on units ordered to move to the caster.
Where was the Create Unit effect on impact targeting?
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