If your commander has multiple triggered abilities, or a static ability and an activated ability with multiple conditions, that can just be overwhelming, and you wind up missing out on opportunities to do good stuff because theres just so many options
Kenrith, the Returned King Kenrith, the Returned King gives you access to the entire color wheel and a ton of activated abilities
Countering a blue spell or destroying a blue permanent is a tad situational, but its super effective when used against the right blue control deck
Notably, this triggers Vexing Puzzlebox
On your turn, you can only play cards from one house, which forces smart sequencing and long-term planning
Guardian of Faith is my pick for one of the best new white cards in a while, and you can read my thoughts behind why designing for Arena is actually a boon to EDH here