Shang Tsung's Deception

Shang Tsung must be cast
Mimic target creature
Cast Shang Tsung's Deception for {x}, {x} being
the mana cost of the target creature
being mimicked
Shang Tsung's Deception's Power/Toughness is
*, * equalling three-fourths of target creature's
When Shang Tsung's Deception is destroyed,
cast one -1/-1 counter on it