Defense Grid
Artifact
Each spell costs 
more to cast except during its controller's turn.
"We've managed to keep the goblins in their assigned areas, but there's little we can do about the smell." —Whip Tongue, viashino technician
Mark Tedin
Urza's Legacy (ULG)
• #125Rulings
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)