Hi,
Yesterday in a friendly match happened to me a strange interaction.
I was playing against mage with my priest deck. My Chameleos morphed in the “Conjurer’s Calling” Twinspell of my opponent.
On my turn, i played the Conjurer’s calling once, destroying a 4 mana minion on my side and getting other two as for card text.
But after using the spell, i got another Conjurer’s Calling card WITH Twinspell signature on it, and was able to play it the next turn (and hence, the next turn again).