The strategy is to play cheap, evasive creatures on turn one, use them to get Yuriko into play on turn two, and then use cards like Brainstorm or Senseis Divining Top to manipulate the top of your library, ensuring you reveal a high-cost card like Draco (16 mana) or Blinkmoth Infusion (14 mana) to deal massive damage to the entire table at once.
In fact, against decks that would usually outmaneuver green, Concordant Crossroads outright turns the tables
Ramp Grixis (blue/black/red) doesn't have access to the land ramp that green makes so easily available, which is fair because it's already a strong color combination
Inquisitor Greyfax is a fairly cheap Human commander who gives your whole board Vigilance, while cheaply tapping down enemy creatures and creating Clue tokens
Will Any of These Cards Ever Be Printed in Paper Magic
Its not exactly Stitcher's Supplier, but its not exactly not Stitchers Supplier