Advanced format ruling
Magic Drain
Card effect (current official text)When your opponent activates a Spell Card: They can discard 1 Spell Card to negate this card's effect, otherwise negate the activation of their Spell Card, and if you do, destroy it.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.