If Herald of Ilharg leaves the battlefield before its last ability resolves, use the number of counters that were on Herald of Ilharg as it last existed on the battlefield to determine how much damage to deal
I wrote in-depth about the cards I think could be boosted by this in my weekly article this week which will be published for everyone to read tomorrow, but, briefly, I think Serras Sanctum is a slam dunk
Palling around with Senator Peacock and Mastermind Plum are a host of devil detectives, insect shamans, and elephant clerics
Yes, since battles are permanents with counters on them, can absolutely proliferate those counters if you want to
Commander decks feel extremely satisfying to play with, especially due to how every match feels different because its so hard to pull the same cards over and over Instead of running tutors to find your win-cons, youre just playing what you have and trying to make the best of it every time
10 mana is a lot but the effects are massive