Skarner, The Crystal Vanguard

When you cast Skarner, The Crystal Vanguard
tap a creature with power less than Skarner, The Crystal Vanguard's.
{t}{4}: Add a crystal artifact token with
({t}: Add any color.)
Skarner, The Crystal Vanguard has +1/+1, vigilance, and haste as long as you control
another artifact.