Creatures becoming copies of other creatures

if I have [[The Ever-Changing 'Dane]] on board and I use it to copy [[Merieke Ri Berit]] and the use the tap ability to steal my opponent's, say [[Grizzly Bears]], and then use 'Dane's ability again to copy something else, will the grizzly bears explode when 'Dane becomes a copy of something else, and if not, would it do so if 'Dane dies or untaps?