Sketchy Salesman

Non-token nonland spells in all hands have
pawn 1 (Exile this card to Shady Salesman, then
create a Gold artifact token with "Sacrifice this
artifact: Add one mana of any color to your mana
pool." Pawn only as a sorcery.)
Spells in Shady Salesman's market have
purchase 4 (Cards with purchase may only be cast
by sacrificing Gold or Treasure tokens equal to its
purchase cost. Any player may cast a spell with
purchase except whoever sold it.)