Pantherion, The Caged Serpent

Pay {x}, Put {x} amount of +1/+1 counters on Pantherion, The Caged Serpent. If five or more counter are put on Patherion, The Caged Serpent transform it.
{t}{3}, Create token artifact named Fang of Revels.
If Fang of Revels is under your control when Pantherion, The Cage Serpent transforms, Sacrifrice it and put three +1/+1 counters on the transformed card