Aetherflux Reservoir [Kaladesh Prerelease Promos] Revised Edition At the beginning of your

At the beginning of your upkeep

The book shrieks horribly until its cover is opened

(They can't be the targets of spells or abilities

Of royal blood among the spirits of the air

−7: Exile the top ten cards of your library

Aetherflux Reservoir [Kaladesh Prerelease Promos] Revised Edition At the beginning of yourSet: Kaladesh Prerelease Promos Type: Artifact Rarity: Rare Cost: {4} Whenever you cast a spell, you gain 1 life for each spell you've cast this turn. Pay 50 life: Aetherflux Reservoir deals 50 damage to any target. While most power is used for ordinary, everyday tasks, one shouldn't underestimate its potential for the extraordinary.