You guys remember way back when, in the time long ago, where they restricted Narset. I can go ahead and assure you that if your deck wants that effect they will now be able to have at least 2 of them.
It is hard to believe that this would not see some amount of play. The fact that it makes you mana rocks is non trivial as well, since we already know from Narset that just shutting off draws for 3 is very good.
Also works in the Notion thief slot, for one less mana of one less color, and is out of gutshot and wrenn and six ping range.
It's too early but this seems like the kind of card that will not only be restricted but will also be a problem even as a restricted card because it is doubling this effect for most players now. Time will tell.