Rack and Ruin resolution question

[Jawman16]

I have 2 artifacts in play and a goblin welder as well.  My opponent cast Rack and Ruin targeting my two artifacts.  In response, I weld out one of them for another artifact in the yard.  Does the Rack and Ruin get countered since the original targets are no longer there?  Does it just kill the one artifact that is left?   Does it kill the one original target and the new artifact that was welded in?  Thanks for the help.

[Toad]

A spell is countered if all its targets are illegal upon resolution. If at least one target is still valid, you try to do as much as possible according to the original choices.

So in your example, the one artifact that is left is destroyed and nothing else happens.

[Jawman16]

Thanks

[Jawman16]

Another question arose, in a recent game, about Rack and Ruin.  If there is only one artifact in play, can it be destroyed with Rack and Ruin?

[Ephraim]

No. Rack and Ruin demands two targets. If two targets are not available, it cannot be played.

[Limbo]

Another question arose, in a recent game, about Rack and Ruin.  If there is only one artifact in play, can it be destroyed with Rack and Ruin?

On the other hand, if there was a card like this:

Ruin And Rack
Destroy target artifact.
Destroy target artifact.

Then with the recent change in targeting rules it IS possible to destroy one artifact with Ruin and Rack. This change in rules was introduced because of the new splice ability in CHK.