While it doesnt increase mana production from mana rocks like Kinnan, Bonder Prodigy, it does help make up for this by turning one of your lands into a creature that can now produce extra mana
it likely rubbed off from some other signed card while the ink was still wet
I think Jirina is a bit better as a commander, but having access to both Trynn, Champion of Freedom and Silvar, Devourer of the Free is excellent
Make sure you delve away the cards you dont want your opponent to give you back with the activated ability
That commander is Tannuk, Steadfast Second, a Kavu Pilot that can cheat out red creatures or artifact cards for a reduced cost, and gives everything haste
Regardless of which way you go about things, Hope Estheim decks did get a major boost from Edge of Eternities