22 Jun 2015
Jace’s Sanctum can reduce alternative costs such as miracle or overload costs.
22 Jun 2015
The first ability of Jace’s Sanctum can’t reduce the colored mana requirement of an instant or sorcery spell.
22 Jun 2015
Jace’s Sanctum’s scry ability will resolve before the instant or sorcery spell that caused it to trigger.
22 Jun 2015
If there are additional costs to cast an instant or sorcery spell, apply those before applying cost reductions.