"These estimates are conservative. Its true capacity may be far, far greater."
—Research notes, signature illegible

Aetherflux Reservoir

Whenever you cast a spell, you gain 1 life for each spell you've cast this turn.
Pay 50 life: This artifact deals 50 damage to any target.

The Brothers' War Retro Artifacts

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.

Kaladesh Remastered

The List

Aetherflux Reservoir's first ability doesn't trigger when you cast Aetherflux Reservoir itself.

The first ability counts spells you cast earlier in the turn even if you didn't control Aetherflux Reservoir as you cast them, and even if those spells were countered.

The first ability counts the spell that caused it to trigger plus any other spells you cast earlier in the turn.

The number of spells you've cast is counted only as Aetherflux Reservoir's triggered ability resolves. For example, if you cast a spell, then respond to the triggered ability with a second spell, you'll gain 4 life total.