2013-07-01 : Blightcaster’s ability will resolve before the enchantment spell that caused it to trigger.

2013-07-01 : If you are the only player who controls a creature when Blightcaster’s ability triggers, you must choose one as the target, although you can choose not to give it -2/-2.

2015-06-22 : If you are the only player who controls a creature when Blightcaster’s ability triggers, you must choose one of those creatures as the target, although you can choose to not give it -2/-2.