Rakazor, Steel-Plated Storm

Flying, hexproof, affinity for artifacts
You may pay for Rakazor's abilities by tapping artifacts you control to pay {1}.
{x}{t}: Rakazor, Steel-Plated Storm deals X damage to all non-artifact creatures.
{x}{t}: You draw X cards.
{x}{t}: Untap X artifacts you control, then tap X artifacts an opponent controls.