Youll most likely be ahead of the curve against your opponent no matter what they choose
Primarily, it may cause you to waste time, or in some cases real money, on cards you have no intention of using
If a different copy of Carnival Barker enters the battlefield, or if Carnival Barker leaves the battlefield and returns, it's a new object and its ability can be activated
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If Cursed Wombat leaves the battlefield while a spell or ability that would put one or more +1/+1 counters on one or more permanents you control is still on the stack, those permanents won't have the additional ability granted by Cursed Wombat when those counters would be put on those permanents, so that additional ability won't trigger
Make sure your rule 0 discussion is a funny one before you spring this on your Commander table