More likely you can achieve it on turn three by playing a one-drop creature on turn one, followed by a spell like Servo Exhibition on turn two
10 Wild-Field Scarecrow Hangin' Around And Scaring The Locals Burnished Hart has been a Commander staple for years, and then Wild-Field Scarecrow came along to provide an even better defense at the cost of absolutely all offense
Some of Jace's competition, on the other hand, has been more long-lastingespecially Emrakul, the Aeons Torn, which, a full 15 years after it was first released, is still the biggest, baddest, most broken creature that Magic has ever produced, as a 15/15 flyer that annihilates your opponent's board when it attacks and gives you an extra turn when you cast it
Why wouldnt you just use Pyxis of Pandemonium as a slow-mill engine
That time has come, so let's begin
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