The inner box with two rows and six dividers makes organizing your cards easy
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
Think about your Commander decks
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
Exiling an attacker mid-combat , creating surprise blockers, or suddenly boosting creatures turns combat math into guesswork for opponents
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