Uro, Titan of Nature's Wrath Ive already praised the design behind the titans from Theros: Beyond Death
While theres nothing wrong with serialised cards per se, their limitation to collector boosters is yet another of Wizards of the Coasts fingers upsetting the scale balanced between game and collectible
If you're playing against a person that you know is playing Chaos Orb (which would be an incredibly rare sight given that the card is not only rare and expensive, but is also illegal in every format except for non-sanctioned games), then you could possibly take advantage of these quirks
For example, cards with the "protection" keyword prevent damage from HP regaining items
Advertisement Flavor Judge is not only a rooster refereeing a fight, but its mechanically hilarious, too
Grim is cheap but he is not oppressive on tempo