I've been searching high and low for this: say a High Priest of Penance (with an indestructible aura) blocks a creature with Rancor, i.e. trample. Can I stop the trample effect by destroying either the creature or the enchantment, before trample happens? Since it first assigns damage to the priest who then can destroy a permanent...?
702.19b The controller of an attacking creature with trample first assigns damage to the creature(s) blocking it.