Iron-Heart, The Unbreakeable

Iron-Heart is unaffected by commander tax.
Shroud, lifelink.
{2}{u}, Sacrifice Iron-Heart: return target artifact to its owners hand, then if you controlled that artifact, add {2} to your mana pool.
{2}{w}, Sacrifice Iron-Heart: return target artifact from your graveyard to the battlefield, all other artifact creatures you control get +1/+1, Shroud, lifelink and "This creature must attack each turn if able".