[Player Management] Whose responsibility to declare effect?

UDEbot

More Machine Than Man
Whose responsibility to declare effect?
from UDE's Player Management Forums

to expand on this, whose responsibility is it to announce they are activating a choice effect? if I summon mobius do I have to announce I am using the effect, or does my opponent have to ask.

In that same sense, if I summon a gadget say nothing and then pick up my deck to search, as I search my opponent then activates Pulling the Rug, am I at fault for not stating I'm activating the effect or is my opponent at fault for not asking if I was activating the effect?

http://entertainment.upperdeck.com/community/forums/thread/1039001.aspx
 
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