Defense Grid
Artifact
Each spell costs 
more to cast except during its controller's turn.
It lights up the sky, beckoning enemies only to repel them.
Mark Tedin
Ninth Edition (9ED)
• #293Rulings
In Two-Headed Giant, spells don't cost extra on your own turn.
(wotc • 2006-05-01)
The additional cost can be reduced by effects that reduce costs, such as Sapphire Medallion.
(wotc • 2004-10-04)
Rulings
In Two-Headed Giant, spells don't cost extra on your own turn.
(wotc • 2006-05-01)
The additional cost can be reduced by effects that reduce costs, such as Sapphire Medallion.
(wotc • 2004-10-04)