smart use of Tarot Card 'XVI - The Tower'

You can try and use Tarot Card "XVI - The Tower" to blow up destroyable objects and walls; for example if you have to save on Bombs or if you want to blow up many things at once. You will need a bit of luck though and you will need to be quick, since you cannot control where the Troll Bombs spawn and you will only have a short amount of time to move them around and / or get Isaac out of harm's way.