Cheapest priced copy (Mystery Booster 2): $0.59 at Card Kingdom, near mint, their price list as of .
Containment Priest 
Creature — Human Cleric · 2/2 · Rare · Core Set 2021 · #13
Flash
If a nontoken creature would enter and it wasn't cast, exile it instead.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
9 printings · $0.59 to $94.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2014 | 5 | Rare | $1.99 | — |
| Core Set 2021 | 13 | Rare | $0.79 | $0.99 |
| Core Set 2021 | 314 | Rare | $1.29 | $3.49 |
| Mystery Booster 2 | 7 | Rare | $0.59 | — |
| Amonkhet Invocations | 3 | Special | — | $42.99 |
| Core Set 2021 Promos | 13p | Rare | $1.99 | $2.99 |
| Core Set 2021 Promos | 13s | Rare | — | $4.49 |
| Time Spiral Remastered | 292 | Special | $2.99 | $94.99 |
| Ultimate Masters | 11 | Rare | $0.79 | $3.99 |
4 rulings from Wizards of the Coast
- 19 March 2021If Containment Priest enters the battlefield without being cast, its ability won't exile itself.
- 19 March 2021Containment Priest's last ability won't affect any creatures that were cast, including ones cast from unusual zones such as your graveyard.
- 19 March 2021If Containment Priest enters the battlefield at the same time as other creatures, its ability won't affect those creatures.
- 19 March 2021If a noncreature card wasn't cast and is entering the battlefield as a creature (due to an effect such as that of March of the Machines), it will be exiled. Conversely, if a creature card wasn't cast and is entering the battlefield as a noncreature permanent (for example, Heliod, Sun-Crowned with insufficient devotion), it won't be exiled.