Library of Alexandria

Set
Arabian Nights
Rarity
Uncommon
Text
T: Add . T: Draw a card. Activate this ability only if you have exactly seven cards in hand.
Legality
Banned in: Commander, Duel, Legacy
Restricted in: Oldschool, Vintage
Rulings
2004-10-04: You may tap multiples of these in response to each other because the requirement for 7 cards is checked only at the time the ability is announced and not again when it resolves.