Karn, The Fair

{1}: Karn, The Fair gets -1/+2 until end of turn. Exile the top card of target players deck. You may play it.
{4}: Create a 0/2 Colorless Construct with lifelink. Then create a dagger token. (its an artifact with equipped creature gets +3/+0 and First Strike. It has equip {3})
When another artifact is put into your graveyard, exile Karn, The Fair and return him to the battlefield, transformed.