Collectible Card Game Headquarters

Describe the Bug:
Izzet Guildmage can't copy sorceries or instants.

Which card did behave improperly ?
Izzet Guildmage

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2014/12/20: Commanding 2014 Urzas,duel

What exactly should be the correct behavior/interaction ?
Izzet Guildmage

Are any other cards possibly affected by this bug ?
-

It's ability is a triggered ability and doesn't occur at the same time as interrupts like Fork, but I was able to copy a Lightning Bolt just fine. I was even able to combine it with a Fork with no problem.