So basically we're playing an inferior card (Portent) to support an average card (Predict)?!?! I was a big fan of Mental Note, but I understand more card draw is needed.

How bout Careful Study? Still puts 3 cards into the yard, but you draw 2. For 1 Blue. And all in one card. So you get the yard refilling of Mental Note, the card draw of Predict, and the casting cost and card selection (well nearly) of Portent, without having to waste any slots on support cards.

When I've been balancing Careful Study vs Mental Note (as I play Bardo's older list), the only disadvantage I see to Careful Study is that it's sorcery speed. But that doesnt seem to be an issue in this flood of Portent we've been seeing. So, anyone else for Careful Study?