Depending on how often your creatures get targeted, an opponent could lose the game in a few turns as more poison counters accumulate
(Jaya Ballard, Karn, Narset, Ob Nixilis, Teferi, Urza, Venser, and Xenagos all also exist as planeswalker cards and separately as legendary creature cards.) Magic 2010 was the first core set to feature planeswalkers, but those cards were simply reprints of the Lorwyn Five
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The same is true of any Auras that become attached to Gideon that can't enchant a noncreature planeswalker
Whether it's Two-Headed Giant or Commander, the only way you're going to push the game forward is by giving yourself something your opponents would rather you didn't have
That said, a card that really shines in this deck is Singularity RuptureSingularity Rupture