Azorius Cluestones but the more I thought about it, the less sense that made. I want to ramp the mana up but I still am running redundant copies of Orim's Prayer and Humility. I need ways to churn through the deck to get to win conditions, or else the game goes too long.
This becomes especially relevant with Mobilization as one of my win conditions. Generating token(s) every turn is important to keep the pressure on, so mana matters. But if I can't draw one, or get a Martial Coup then I'm really struggling to close things out.
So I split the difference: two Cluestones for two Complusions.
Fortunately, things seem to be working well. Fuz was playing a B/W deck using Exquisite Blood as a win condition-and I handled it just fine. (As a small rules note: cards like Academy Rector do not trigger under a Humility, because the game checks to see what the card was when it left play. )
Thankfully, Humility solves those problems.
However until Humility shows up, sometimes Orim's Prayer has to step in and take care of things, as you can see in the picture. 4/4s that only do one point of damage to me are not as effective at closing out the game as they would be otherwise.
(As a second rules note: Humility before Mobilization means my tokens have vigilance. The other way around and they don't).