16 Apr 2021
If at least one target is still legal as Quandrix Command tries to resolve, it will resolve and do as much as it can.
16 Apr 2021
If all of Quandrix Command's targets are illegal as it tries to resolve, it will do nothing.
16 Apr 2021
As Quandrix Command tries to resolve, if the fourth mode is chosen and all of the target cards are illegal, but the target player is still legal, that player will still shuffle their library.