Collectible Card Game Headquarters

Describe the Bug:
Activating Touchstone's activated ability doesn't do anything. Touchstone is tapped, but its controller is not prompted to choose a target.

Which card did behave improperly ?
Touchstone

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
KOT, duel

What exactly should be the correct behavior/interaction ?
Touchstone's activated ability works as intended.

Are any other cards possibly affected by this bug ?
-

Fixed in 7dd12d8

Works, but could the help text read 'select target artifact you don't control' instead of just 'select target artifact'?

Fixed in b3a5579