Aetherflux Reservoir

Mana cost: {4}
Type: Artifact
Set: Kaladesh Promos #192s (rare)

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.

Aetherflux Reservoir has 7 printings, first in Kaladesh (2016). EDHREC ranks it #364 among Commander cards. It appears most in Oloro, Ageless Ascetic decks (14,228 on EDHREC). 1 public deck on TCG runs it. It has 4 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: legal

Public decks that run Aetherflux Reservoir

Hatsune Miku - Secret Lair Commander, led by Trostani, Selesnya's Voice

Commanders that run Aetherflux Reservoir most

Deck counts from EDHREC.

Often played with Aetherflux Reservoir

Cards that show up in the same decks on EDHREC.

Rulings

2016-09-20: The first ability counts the spell that caused it to trigger plus any other spells you cast earlier in the turn.
2016-09-20: 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.
2016-09-20: Aetherflux Reservoir's first ability doesn't trigger when you cast Aetherflux Reservoir itself.
2016-09-20: 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.