Cheapest priced copy (Bloomburrow): $1.29 at Card Kingdom, near mint, their price list as of .
Colossification 
Enchantment — Aura · Rare · Bloomburrow · #392
Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature gets +20/+20.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
6 printings · $1.29 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Bloomburrow | 392 | Rare | $1.29 | — |
| Ikoria: Lair of Behemoths | 148 | Rare | $1.49 | $1.49 |
| Ikoria: Lair of Behemoths | 327 | Rare | $4.49 | $10.99 |
| Ikoria: Lair of Behemoths | 364 | Rare | — | $1.29 |
| Ikoria: Lair of Behemoths Promos | 148p | Rare | $6.49 | $1.99 |
| Ikoria: Lair of Behemoths Promos | 148s | Rare | — | $2.49 |
One ruling from Wizards of the Coast
- 17 April 2020Colossification can be attached to a creature that's already tapped. Its middle ability won't have any effect, but its last ability certainly will.