Cheapest priced copy (Alara Reborn): $0.35 at Card Kingdom, near mint, their price list as of .
Crystallization 
Enchantment — Aura · Common · Alara Reborn · #144
Enchant creature
Enchanted creature can't attack or block.
When enchanted creature becomes the target of a spell or ability, exile that creature.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Alara Reborn | 144 | Common | $0.35 | $0.99 |
One ruling from Wizards of the Coast
- 1 May 2009When the enchanted creature becomes the target of a spell or ability, Crystallization’s last ability will trigger. When that ability resolves, that creature will be exiled, even if Crystallization has left the battlefield or is enchanting a different creature by that time. If Crystallization is still enchanting the same creature, Crystallization will then be put into its owner’s graveyard as a state-based action.