Your search for "Lodestone Myr 200" revealed the following:
Lodestone Myr (MRD) from Mirrodin, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Greg Staples Card Text:TrampleTap an untapped artifact you control: Lodestone Myr gets +1/+1 until end of turn.
Lodestone Myr (Foil) (MRD) from Mirrodin, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Greg Staples Card Text:TrampleTap an untapped artifact you control: Lodestone Myr gets +1/+1 until end of turn.
Lodestone Myr (HOP) from Planechase, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Greg Staples Card Text:TrampleTap an untapped artifact you control: Lodestone Myr gets +1/+1 until end of turn.
Lodestone Myr (Foil) (MM2) from Modern Masters 2015, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Greg Staples Card Text:TrampleTap an untapped artifact you control: Lodestone Myr gets +1/+1 until end of turn.
Lodestone Myr (MM2) from Modern Masters 2015, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Greg Staples Card Text:TrampleTap an untapped artifact you control: Lodestone Myr gets +1/+1 until end of turn.