Magnetomancer

Ward {x}, where X is the number of noncreature artifacts you control (Whenever this permanent
becomes the target of a spell or ability an opponent controls, counter it unless that player pays {x}.)
{1}{w}, Sacrifice a noncreature artifact: Tap target permanent. If this ability targets an artifact, it
doesn't untap during its controller's next untap
step unless that player pays {x}, where X is the
number of noncreature artifacts you control.