Cheapest priced copy (Planar Chaos): $0.79 at Card Kingdom, near mint, their price list as of .
Magus of the Library 
Creature — Human Wizard · 1/1 · Rare · Planar Chaos · #134
{T}: Add {C}.
{T}: Draw a card. Activate only if you have exactly seven cards in hand.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.79 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Planar Chaos | 134 | Rare | $0.79 | $4.99 |
| Special Guests | 154 | Mythic | $0.99 | $0.99 |
One ruling from Wizards of the Coast
- 4 October 2004You 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.