For green ramp decks you don't need these heavy ongoing mana sources
With Primus, Ashnod's Altar, and your choice of Anafenza, Kin-Tree Spirit / Juniper Order Ranger / Cathars' Crusade, you can sacrifice the Primus to the Altar, it'll return to the battlefield with a -1/-1 counter that is immediately removed when you add a +1/+1 counter to it, and then repeat the loop to blow up all your opponent's noncreature permanents (including lands!)
3) Sword of Forge and Frontier $18 A powerful card indeed
Yet another factor in the performance of Jace in constructed is that you only see him when he is the right card for the deck
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Un- sets are far on the casual side of the competitive-casual scale and see high variance as a plus (competitive formats want consistency, whereas casual formats prefer that exciting things happen)