Cheapest priced copy (Conspiracy): $0.99 at Card Kingdom, near mint, their price list as of .
Magus of the Mirror 
Creature — Human Wizard · 4/2 · Rare · Time Spiral · #116
{T}, Sacrifice this creature: Exchange life totals with target opponent. Activate only during your upkeep.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.99 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conspiracy | 117 | Rare | $0.99 | $2.49 |
| Time Spiral | 116 | Rare | $1.29 | $2.49 |
2 rulings from Wizards of the Coast
- 25 September 2006When the life totals are exchanged, each player gains or loses the amount of life necessary to equal the other player’s previous life total. For example, if player A has 5 life and player B has 3 life before the exchange, player A will lose 2 life and player B will gain 2 life. Replacement effects may modify these gains and losses, and triggered abilities may trigger on them.
- 1 January 2011If an effect says that a player can’t lose life, that player can’t exchange life totals with a player who has a lower life total; in that case, the exchange won’t happen.