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Then for the activated ability, to permanently take a +1/+1 counter, shield counter, or first strike counter from an opponent is simply a steal

however, there really is a good case for diminishing returns applying to all of these

One of the closest comparisons to this card is Glen Elandra Archmage who is significantly better despite having less re-usability and less range on its counter effect

What I want to do is to build up a nice Commander kill with my background, it's +1/+1 counters, and then equipment, and then in my post-combat phase, cast a mass sweeper to keep Durnan alive, and then later the creature

The inner box with two rows and six dividers makes organizing your cards easy