Aggressive blue decks do exist, and they bring a uniquely blue flavor to typical creature beatdown
Once each turn, whenever you cast a spell, you can put it on the bottom of your library to reveal cards from the top until you find a nonland card, which you can then cast for free
Creature removals should be slightly more than artifact and enchantment removals while countermagic is always very strong
Entering with an indestructible counter could make for some interesting plays, especially with more counter-loving tools floating about after both New Capenna's Commander decks and Phyrexia: All Will Be One's flood of proliferation
Funnily enough, I'm pretty sure that when Richard first pitched the threshold mechanic, it was at seven cards, but we must have fiddled with it in design
Narset, Enlightened Master I wish Golos, Tireless Pilgrim wasnt banned in Commander, as it would easily take the top spot