He costs 2 so you can cascade into him instead of your 0cmc cards and cockblock yourself.
You can't even cascade into him in YOUR first turns so you...
So you can Standstill, then use Jace to draw cards or Plot a bunch of spells, then cast them for 0 whenever opponent pops Standstill. You could even...
You can already cast them with As Foretold.
Made a Modern deck with that and a bunch of Time Walk effects a few years ago which was janky but fun as...