Glass Asp

Creature - Snake 2/1, 1GG (3)
Whenever Glass Asp deals combat damage to a player, that player loses 2 life at the beginning of his or her next draw step unless he or she pays {2} before that step.
Its venom induces a fever that causes its victims to relive the attack in recurring, haunting visions.
Illus. Richard Kane Ferguson

Gatherer Card Rulings [Nov 2009]

• 9/25/2006: After Glass Asp's triggered ability resolves, the affected player has the ability to perform a special action of paying {2}. This action may be performed any time the player has priority, and it doesn't use the stack. It may be performed only once. Once that player's next draw step begins, the player no longer has the ability to perform this action. If the player performed the action, the delayed "lose 2 life" triggered ability won't trigger. Otherwise, it will.

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/9)	Time Spiral (Common)