Nak, Field Researcher

Whenever Nak, Field Researcher enters the battlefield create a token with haste that is a copy of an artifact with converted mana cost 2 or less you control. Sacrifice it at the beginning of the next end step.
{2}{x},{t}: Create a token with haste that is a copy from an artifact in your graveyard with converted mana cost {x}. Sacrifice it at the beginning of the next end step.