What happens if three Duck cards triggers on a Cone of Cold? Does the card move around the three Duckers or are copies created? Can only one trigger? When the 'taken' card is used, is it discarded into the takers hand, the original players' hand or does it vanish? Where does the original card go? Vanish, moved to other hand, or discard pile?
Each one gets a copy of the spell. Note that you have to have three separate Duck cards, since block cards can only trigger once per action even if they're shared by several targets.
There is no discard pile. Are you asking if you can draw it again the next time your deck recycles? No. Once you use it, it's gone.
Apparently whatever you cast also counts as "controlled by enemy" - so Ducked Cone of Cold cannot be Purged by enemy priest because it counts as cast by his own team.
I suspect that this issue does not come up often, but is unintentional and should be considered a [minor] bug.
Heh, this reminds me of a situation I ran into the other day. I ducked two dwarven war cries in a row in a 3xdwarf v 3xdwarf matchup. Unfortunately not two ducks on the same war cry, but hilarity still ensued as more war cries were used. It would be interesting to see two dwarves with duck and one with war cry on two teams playing each other. The war cries are multiplying! Although actually, now that I think about it, I wonder if something that's been ducked like that is also unblockable due to the control issue. I think both myself and a lot of other people would have noticed by now if that were the case though.