![Silent Observer [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/1667690d-5460-5c06-b6c3-f7fe5176eca7.jpg?v=1768423387&width=100&height=139&crop=center)
Mystery Booster
Mercurial Geists
CA$0.50
Description
| Set: | Mystery Booster |
| Type: | Creature — Spirit |
| Rarity: | Uncommon |
| Cost: |    |
Flying
Whenever you cast an instant or sorcery spell, Mercurial Geists gets +3/+0 until end of turn.
Whenever you cast an instant or sorcery spell, Mercurial Geists gets +3/+0 until end of turn.
"Procedural misstep: provocation of geists for the purpose of yielding more energy can compromise containment units. Next action: clean up mess."
—Laboratory notes
Produits associés
Produits complémentaires configurés ou, à défaut, suggestions automatiques générées par Shopify.
![Divination [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/48bd68af-1789-5757-a23b-94391b2ff46c.jpg?v=1768423624&width=100&height=139&crop=center)
Mystery Booster
Divination
![Celestial Crusader [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/dac33596-1872-50d5-8241-a9e61eff966a.jpg?v=1779902834&width=100&height=139&crop=center)
Mystery Booster
Celestial Crusader
![Geist of the Moors [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/c334617a-584f-59bb-8043-52374654a78e.jpg?v=1768424928&width=100&height=139&crop=center)
Mystery Booster
Geist of the Moors
![Act on Impulse [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/2bb6667b-3e76-56f1-afcc-4bb835b7ca94.jpg?v=1768423135&width=100&height=139&crop=center)
Mystery Booster
Act on Impulse
![Alpine Grizzly [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/447462d4-cdd6-51be-8a1b-ffca24db8ac6.jpg?v=1768425140&width=100&height=139&crop=center)
Mystery Booster
Alpine Grizzly
![Amass the Components [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/e4529e60-4917-55af-873d-57bec2c8670d.jpg?v=1768423967&width=100&height=139&crop=center)
Mystery Booster
Amass the Components
![Alchemist's Refuge [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/15df86fa-b8c3-535f-b35e-a200d2ba92a7.jpg?v=1779902621&width=100&height=139&crop=center)
Mystery Booster
Alchemist's Refuge
![Aid the Fallen [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/da1512f4-2f2b-5395-a0a7-e8775581495c.jpg?v=1768423994&width=100&height=139&crop=center)
Mystery Booster
Aid the Fallen
![Ahn-Crop Crasher [Mystery Booster]](https://cdn.shopify.com/s/files/1/0770/3894/4575/files/8384696b-2c05-5812-8e6c-e159d696c297.jpg?v=1768423135&width=100&height=139&crop=center)
Mystery Booster