L-13, Madened Scientist

When L-13, Maddened Scientist enters the battlefield, exile target creature an opponent controls until L-13, Maddened Scientist leaves the battlefield. Create a token that is a copy of the exiled creature. Tokens you control are artifacts in addition to their other types.
{x}{u}{u}: Create a token that is a copy of target creature with mana value {x} or less.
{4}{b}: Create a token that is a copy of target creature that is in a graveyard.