Young Polymorphist

You may choose not to untap Young
Polymorphist during your untap step.
{x}{t}: Target creature with converted mana cost
X loses all abilities and becomes a blue Frog with
base power and toughness 1/1 as long as Young
Polymorphist remains tapped.
"What do you want me to turn it into? Is it a frog? I
hope it's a frog. That's the only thing I know how to
do"