Cheapest priced copy (Core Set 2019): $0.79 at Card Kingdom, near mint, their price list as of .
Mistcaller 
Creature — Merfolk Wizard · 1/1 · Rare · Core Set 2019 · #62
Sacrifice this creature: Until end of turn, if a nontoken creature would enter and it wasn't cast, exile it instead.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.79 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2019 | 62 | Rare | $0.79 | $2.99 |
| Core Set 2019 Promos | 62s | Rare | — | $2.79 |
3 rulings from Wizards of the Coast
- 13 July 2018If Mistcaller enters the battlefield at the same time as other creatures, its ability can’t be activated in time to affect those creatures.
- 13 July 2018Mistcaller’s ability doesn’t stop creature tokens from entering the battlefield. It also doesn’t affect creatures that are already on the battlefield.
- 13 July 2018Mistcaller’s ability won’t affect any nontoken creatures that were cast, including ones cast from unusual zones such as your graveyard.