Guardian Shield-Bearer #189
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Card Details
Megamorph 
When this creature is turned face up, put a +1/+1 counter on another target creature you control.
2/1
Illustrated by Lindsey Look
Rulings (3)
Feb 25, 2015
If 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.
Feb 25, 2015
Megamorph is a variant of the morph ability. You can find more information on morph on cards with morph from the Khans of Tarkir set.
Feb 25, 2015
Turning 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.