Mana Drain | Magic: The Gathering
Formats Mana Drain is Legal in
Official Oracle Text for Mana Drain
Official Rulings for Mana Drain
10/1/2009 : If the targeted spell is an illegal target by the time Mana Drain resolves, Mana Drain is countered. You won't get any mana later.
10/1/2009 : Mana Drain's delayed triggered ability will usually trigger at the beginning of your precombat main phase. However, if you cast Mana Drain during your precombat main phase or during your combat phase, its delayed triggered ability will trigger at the beginning of that turn's postcombat main phase.