Cheapest priced copy (Dragon's Maze): $0.35 at Card Kingdom, near mint, their price list as of .
Krasis Incubation 
Enchantment — Aura · Uncommon · Dragon's Maze · #79
Enchant creature
Enchanted creature can't attack or block, and its activated abilities can't be activated.
{1}{G}{U}, Return this Aura to its owner's hand: Put two +1/+1 counters on enchanted creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dragon's Maze | 79 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 15 April 2013Returning Krasis Incubation to its owner's hand is part of the cost to activate its last ability. Once that ability is announced, players can't respond to it until after you've paid its activation cost and returned Krasis Incubation to hand.
- 8 June 2016Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.