Prices are hard to gauge and vary wildly based on individual taste, more like modern art than Magic cards in some ways
Legendary horrors, nightmares, demons, and spirits are a good place to start, followed by anything from Magic sets that take place on planes like Innistrad and Duskmourn
Stitch Rock Star has the passive ability ADORING FANS which allows you to exert a character as soon as you play it to draw a card
The FCA reprint we're getting here is already around $10 cheaper than the card's MH1 printing, down from $33
Songs can be used on the turn they are played if you pay their cost outright, or if you have a character that can sing the song and can be exerted
Its a high-risk, high-reward strategy that often ends with a win from single-digit life