My thought with
Solemnity is that I hold on to it until after I have counters on things. It would allow more counters, but also wouldn't remove the ones I already have on creatures.
I kept Gaddock because I narrowed down more of the selection to minimize the 4+ CMC items I had and figured it would be more of a problem for my opponents than myself. I still have 2 main, 1 offense, 1 mana fixing, 1 stax, and 3 removal items that would be stopped by him. That's 8/100 cards, or 8/64 playable cards if you ignore land. Having 1/8th of the deck shutdown is troublesome. Actually calculating it makes it seem more likely to be a hindrance than when I was narrowing the cards.