Aetherflux Reservoir

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

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.

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