This is one reason why multi-Energy decks are often harder to build than single-type decks
You can do so by searching for your card, clicking Advanced, and checking the Sold listing box
Inefficient, but if you cant afford the good tutors or can and are using busted black fast mana in your cEDH K'rrik, Son of Yawgmoth monster, Dimir House Guard does the work
Ragavan FTW: These are the best cards in Modern Horizons 2 The flipside of this is Tovolar, the Midnight Scourge - a 4/4 that still lets you draw cards, but also allows you to pay X, one Red, and one Green, to give a Wolf or Werewolf you control +X/+0 and Trample until the end of the turn
This will help you set a fair and reasonable price
An excellent strategy in green and black for exploiting flashback is to include spells with flashback in a deck that tries to fill its own graveyard to reanimate creatures