Twinning Glass

Text:

, : You may cast a spell from your hand without paying its mana cost if it has the same name as a spell that was cast this turn.

Rulings:

• 10/1/2007 Activating Twinning Glass’s ability allows you to cast a single card from your hand as it resolves. It doesn’t create a continuous effect, and it doesn’t let you cast multiple cards for free.
• 10/1/2007 It doesn’t matter who cast the first spell.
• 10/1/2007 You can’t pay any alternative costs (such as those from evoke or morph) when casting the card. On the other hand, if the card has additional costs (such as those from kicker or buyback), you may pay those.