Artifactory

{1}{t}: Put a 1/1 artifact creature token into play.
{2}{t}: Put a 1/2 or 2/1 artifact creature token into play.
{3}{t}: Put a 2/2 artifact creature token or a 1/1 artifact creature token with flying into play.
{4}: Until end of turn, you may play the above abilities without their paying their {t} cost.