While similar in stats, Kenrith has five different activated abilities, each tied to a different color
The same goes for Nature's Wrath, which can be a great way to slow down decks especially if they play both blue and black
If you draw it off the top, odds are you'll have some use for it to cast a big demon or a smattering of cheaper spells
My logic behind this choice is that in the event Gisela gets removed, you can always cast Bruna from the command zone in order to recur herwith the obvious exception of exileso I think that the likelihood of melding them into Brisela is higher with Bruna in the command zone
It is mostly a collection of small subtle effects that combine to make this the best performing Confluence in cube
Since Eldrazis are mostly colorless creatures, look for colorless mana adding cards as well that can benefit your entire board greatly