Advanced format ruling
Mirage of Nightmare
Card effect (current official text)Once per turn, during your opponent's Standby Phase: Draw cards until you have 4 cards in your hand. If you do, during your next Standby Phase after that: Randomly discard the same number of cards you drew (or your entire hand, if you do not have enough cards).
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.