Petra, Keeper of Crystals

Ward - Sacrifice a nontoken artifact with a mana ability.

When Petra, Keeper of Crystals deals damage to a player untap all artifacts with a mana ability that you control.

If a nontoken artifact with a mana ability would be put into a graveyard from anywhere, create a token that's a copy of that artifact.

Each glittering stone shone with mystic brilliance,
yet I could hold none. They were hers, and they
answered only to her.