Many abilities have charges and can only be used once or twice
Does your Temur deck with two Curates, a Campus Guide, two Field Trips, and Cultivate really need an 18th land over another spell
Both Partner Commanders and Hunting Velociraptor are very cool designs, and they each work well together
Bruna, Light Of Alabaster An Enchanting Take On Voltron An Azorius (blue/white) Angel for six mana, Bruna may be somewhat mana intensive when compared to other entries on this list, but it can make for a strong commander choice for an Aura-based Voltron deck
With Shroud, you're prevented from interacting with your own creature you can't target them with anything, which can backfire depending on the deck
Of the true long shots, none of them have yet managed to hit the targets I set for them should they see widespread play