Remember, you may be holding these boxes for a few years and it is still possible for the value of what you buy to decline rather than go up, but that tends to be more the exception than the rule with these sales
Karlov of the Ghost Council A really inexpensive commander with a removal ability, Karlov of the Ghost Council is decent Orzhov lifegain commander who lets you run your Soul Sisters with the Sanguine Bond + Exquisite Blood nonsense you love
In practice, it immediately becomes a 6/6 flying lifelink the moment youre above 30 life, which in Commander means its usually online the second it hits the battlefield
Orim's Chant takes it a step further by also preventing one targeted player from attacking, which gives you both combo protection and breathing room
I built around the ninjutsu and other self-bouncers here - But you could make this flickering too instead
Once demand has been sated, Ketramoses price will likely see a readjustment.