Peridot, Diamond's Minion

{x}{t}: play an artifact with converted mana
cost {x} from your graveyard, paying all costs.
{1}: Until end of turn, target untapped
artifact you control becomes an equipment
and equips to Peridot. Peridot gets +X/+X,
where X is the artifact's converted mana cost.
If Peridot is dealt X or more damage,
sacrifice that artifact.
If Peridot dies while it has an equipment,
you may put Peridot on top of your library.