Cheapest priced copy (Urza's Destiny): $0.35 at Card Kingdom, near mint, their price list as of .
Momentum 
Enchantment — Aura · Uncommon · Urza's Destiny · #113
Enchant creature
At the beginning of your upkeep, you may put a growth counter on this Aura.
Enchanted creature gets +1/+1 for each growth counter on this Aura.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Urza's Destiny | 113 | Uncommon | $0.35 | $4.99 |
One ruling from Wizards of the Coast
- 4 October 2004Putting on a counter is optional. If you forget, you can't go back later even if it is something you usually do.