Collectible Card Game Headquarters

Describe the Bug:
I had the known "AddCard error: No more room in cd to add card" error for which a lot of work had been made here: viewtopic.php?f=110&t=11971&hilit=cd+error+no+room
Maybe my report provides new info,so:I cast Prototype Portal for 0 although I had an artifact to imprint and then I got this error few times.I loaded the savegame though and the error persisted even when imprinting the artifact. wrong

Which card did behave improperly ?
Rusted Relic? metalcraft? clause "is a x creature" ?

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/01/15: Battle For Zendikar v2,duel

What exactly should be the correct behavior/interaction ?
Rusted Relic

Are any other cards possibly affected by this bug ?
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1) I don't entirely get what you are saying. How can you cast Prototype Portal for 0 when there is no X in the cost?

2) If you imprint with an artifact there is no error until you try to use it, and then all hell breaks loose.

3) Could the prompt say "Select Artifact from your hand" or use the dialog for choosing a card in hand rather than a generic "Select target artifact"?

Sorry,for the wrong phrasing.I meant that although I had an artifact to imprint I decided to cast Prototype Portal without imprinting the artifact.

I had a lot of these - AddCard error:No more room - errors lately and I discovered that the card that causes them is in fact Rusted Relic which was the problem also here and not Prototype Portal.
It seems that after Rusted Relic metalcraft triggers and is a creature then a couple of activations or plays trigger the error.
After the error usually for a step or 2, Rusted Relic stops being a creature although metalcraft is still on as you can see in screenshots.

Is it only Rusted Relic? is it the clause "is a x creature as long" the problem? Is it metalcraft?

In dev 778ccb5 version but I believe in earlier version as well,
Titania's Song produces easily the "Add type error:no room in CT to add another type" for instance with only 1 artifact in play (there are other creatures)and couple of plays and you get the error.
I believe something is too wrong with the code of animate artifacts and not particular cards. There is the above bug for Rusted Relic and probably the one for Tezzeret the Seeker ultimate here that we thought it was Berserk 's fault:
viewtopic.php?f=110&t=16745&p=176369&hilit=no+more+room#p172882
All 3 have animate artifact in common.