Mirrodin is the artifact plane created by the planeswalker Karn, so it made sense at the time to make a mechanic centered around artifacts that rewards you for playing them
Released in the Murders at Karlov Manor, she solves the biggest issue with Investigate decks, hand size
Illustrated by Evyn Fong Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Tinybones, Bauble Burglar Tinybones, Bauble Burglar turns discard into theft by exiling opponents cards with stash counters and letting you play them
What really makes an Edgar Markov deck pop, though, is if you play him with mass land destruction, such as Ravages of War or Armageddon, resetting the board on turn four, while everyone else is trying to set themselves up with extra lands