Veigar, Tiny Master of Evil

When Veigar, Tiny Master of Evil enters the
battelfield, create a 0/0 colorless Construct
artifact creature token with "This creature gets
+1/+1 for each artifact you control."
Tap an untapped artifact you control:Add{u}
{5}: Shuffle your library, then exile the top
card. Untill end of turn, you may play that
card without paying it's mana cost.