Cheapest priced copy (Streets of New Capenna Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Maestros Diabolist 
Creature — Vampire Warrior · 1/4 · Rare · Streets of New Capenna Promos · #200p
Deathtouch, haste
Whenever this creature attacks, if you don't control a Devil token, create a tapped and attacking 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target."
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Streets of New Capenna Promos | 200p | Rare | $0.49 | $0.49 |
| Streets of New Capenna Promos | 200s | Rare | — | $0.99 |
| Streets of New Capenna | 200 | Rare | $0.49 | $0.49 |
| Streets of New Capenna | 318 | Rare | $0.49 | $0.49 |
| Streets of New Capenna | 383 | Rare | — | $0.49 |
One ruling from Wizards of the Coast
- 29 April 2022Maestros Diabolist's triggered ability has an "intervening 'if'" clause. This means that it checks to see if you control a Devil token both when the ability triggers and when it resolves. Notably, this means that attacking with two Maestros Diabolists will normally cause you to create only one Devil token.