Thats still pretty good for artifact decks, and extra mana generation plays quite well with Future Sight effects
(2017-08-25) If an effect would set your life total to a certain number that's different than your current life total, that part of the effect won't do anything
Is it underpowered by today's standards
If you do, return the chosen card from your graveyard to the battlefield and it gains "If this permanent would leave the battlefield, exile it instead of putting it anywhere else." If Spirit-Sister's Call leaves the battlefield, the replacement effect continues to apply
Mana Curve The mana curve seems more middle-range centered that usual, with many drops on 4-5 drop positions, a spike at 4 drops and an absence of 8+ drops
Two mana is a bargain with the drawback being fairly inconsequential and offers blue the chance of a big cheap guy, something it otherwise fails at