Cheapest priced copy (Masters 25): $0.35 at Card Kingdom, near mint, their price list as of .
Ainok Survivalist 
Creature — Dog Shaman · 2/1 · Common · Masters 25 · #157
Megamorph {1}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)
When this creature is turned face up, destroy target artifact or enchantment an opponent controls.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
5 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 157 | Common | $0.35 | $0.49 |
| Commander 2019 | 156 | Common | $0.35 | — |
| Dragons of Tarkir | 172 | Uncommon | $0.35 | $0.79 |
| Murders at Karlov Manor Commander | 165 | Uncommon | $0.35 | — |
| The List | DTK-172 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 25 February 2015Megamorph is a variant of the morph ability. You can find more information on morph on cards with morph from the Khans of Tarkir set.
- 25 February 2015Turning a face-down creature with megamorph face up and putting a +1/+1 counter on it is a special action. It doesn't use the stack and can't be responded to.
- 25 February 2015If a face-down creature with megamorph is turned face up some other way (for example, if you manifest a card with megamorph and then pay its mana cost to turn it face up), you won't put a +1/+1 counter on it.