Mishra and Urza, Brothers

Each noncreature artifact you control, is an
artifact creature with power and toughness each
equal to its mana value.
Whenever you cast an artifact spell, you may pay
2 life. If you do, you may copy that spell (copy
becomes a token).
Sacrifice two artifacts: Exile target artifact in your graveyard. You may cast it this turn. If it would
leave the battlefield, exile it instead.