I get frustrated when I play an enhancement and my opponent negates or interrupts it somehow and then I have an ITB play next card in my hand but nothing to go with it, and I wish I could have passed init to my opponent from the start. Well, what if we had an enhancement that could reactivate/reprioritize an enhancement that had already been played? For example, "Interrupt the battle and select a good enhancement in battle. Play that enhancement again."