Flowstone Matriarch

At the beginning of each opponent's upkeep,
that player sacrifices an artifact.
Each noncreature, non-Equipment artifact is an
Equipment with equip {x} and "Equipped
creature gets +X/+0," where X is that artifact's
mana value.
Metalcraft—{t}, Discard a card: Gain control
of target noncreature artifact with mana value
less than Flowstone Matriarch's power.