Cheapest priced copy (Throne of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
So Tiny 
Enchantment — Aura · Common · Jumpstart 2022 · #349
Flash
Enchant creature
Enchanted creature gets -2/-0. It gets -6/-0 instead as long as its controller has seven or more cards in their graveyard.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 64 | Common | $0.35 | $0.49 |
| Jumpstart 2022 | 349 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 4 October 2019So Tiny continuously checks the enchanted creature's controller's graveyard to determine just how tiny the enchanted creature is.